As the first outing for Detective Lockhart, Knock Knock is a little longer than most as the author has clearly taken time with both of our investigative protagonists and the peripheral characters alike to ensure that this is a great start to a series.

It's a pacy and addictive read, with more than a few moments you may feel physically as well as emotionally because it is simply that immersive. Enjoy!

I did not finish this one, it was not for me, I couldn't relate to the characters, and just did not care for the story.

Enjoyed this a lot, great twists and turns. As this is the start of a series, I'm looking forward to reading more cases in the series.

A great book filled with good characters who all have an interesting backstory
A well written, well paced thriller.

A great new start to a new police procedural series. I'm definitely interested in reading more by this author - can't wait to see where he takes the characters.

Thanks to Netgalley for the ARC without obligation.

Let me start this review by saying that this book by Chris Merritt is a fantastic police procedural book. Well written and well created characters, the story was well crafted and I really liked the central characters, DI Dan Lockhart and Dr Lexi Green. And the best part of this book was that I could not guess who the killer was till he was revealed. This book kept me guessing and on my toes. I really enjoyed every bit of this book. Would not hesitate to recommend this book. Thank you Chris Merritt for this brilliant book. And a big thank you to NetGalley and Bookouture for giving me this book in exchange of my review..

Great thriller that kept me engaged from start to finish. Fabulous plot and characters, and author I will definitely read more of!

Detective Dan Lockhart is called to investigate when a woman is found murdered in her home. He's surprised to see that the scene is similar to another murder that took place months ago. But that murderer was caught and sent to prison.

Lockhart wonders if they put an innocent man away. And what connects the two victims? Fearing he has a psychopathic serial killer on his hands, he calls in Dr. Lexi Green to help put a profile together. Tough and smart, Lexi will stop at nothing to hunt down the man responsible for the deaths.

Then a third body is discovered. Lexi has found a clue that she feels will lead to the killer, but Dan's team isn't too sure. Fearing that they are pushing her away from the investigation, she puts herself out there as bait.

This is the suspenseful beginning of a crime fiction series. I love getting in on the ground floor of a new series, reading the characters backstories, finding those little gems that make a good series even better.

The characters are finely drawn, fully fleshed out, and their investigation is realistic, police procedural is credible. This is an action filled page turner with twists and turns that lead to a most unexpected conclusion.

Many thanks to the author / Bookouture / Netgalley for the digital copy of this crime fiction. Read and reviewed voluntarily, opinions expressed here are unbiased and entirely my own.

Thank you NetGalley and Bookouture for the advanced copy of Knock Knock

This is the first book in a new series and hopefully not the last. I enjoyed the story and the writing style and look forward to more. Recommended.

This multiple character viewpoint novel is very well written. The two main characters are flawed in believable ways which draw them together for work and there is a good degree of chemistry between them too. The murders are particularly gruesome and I do wish I could have figured out how to read those bits while hiding behind my hands. Overall, an excellent read and I am very much looking forward to reading book number two.

*4.5 Stars*

Copy kindly received via NetGalley in exchange for an honest review.

This was a really good read and had interesting characters. I was guessing who the culprit was the whole time, and kept on the edge of my seat. I look forward to reading the next book in the series.

Thank you to NetGalley, Bookouture. And Author Chris Merritt for my advanced copy of Knock Knock, in exchange for an honest review

Knock Knock by Author Chris Merritt is the first book in a new series featuring Detective Dan Lockhart. I enjoyed it and looking forward to the next in the series. Recommended.

I’ve read a couple of Chris Merritt’s Zac Boateng series, so I was intrigued to see what these new characters, Detective Dan Lockhart and Dr Lexi Green, were like.

Knock Knock is a tension packed serial killer thriller and a great introduction to these new characters.

Dan is a former soldier suffering from mental health issues after his wife disappeared years earlier. Lexi is a talented psychiatrist who can hold her own in most situations. I sensed a bit of romantic tension between the two but having read Chris Merritt’s previous books he never makes anything easy for his characters!

I really enjoyed the secondary cast of characters from Dan’s team, particularly Max, who’s not only a woman trying to make it in a male dominated profession but she’s also missing two fingers and a thumb on one of her hands.

The serial killer in this novel was one of the most despicable I’ve come across, choking women with a metal ball. Yes, all serial killers are awful but this one’s hatred of women and all their accomplishments really dripped from the pages.

I did get a little frustrated with Dan and his team, I mean they brought Lexi in and then pretty much ignored what she said. I hope in the future novels this changes!

This was a solid start to the series with plenty of room for characters to grow. I’m looking forward to reading the second instalment Who’s Next?

The first in a new series, I enjoyed learning about DI Lockhart and psychologist Lexi Green.
A gruesome killing leads Dan to suspect they are dealing with a serial killer, and he invites Lexi in to provide input. Dan has known her through counseling sessions caused in part by the unresolved disappearance of his wife while he was away serving in the military. The different layers of mystery make the book very readable, I kept wanting to know how things would turn out. Thanks to NetGalley and the publisher for an advance copy of this book to read in exchange for my honest review. I will definitely be looking forward to book two of the series.

After missing the download deadline I purchased this book to read as it seemed like it was going to be a good one. I can honestly say that I wasn't disappointed, Love the writing style, plot and characters and had to keep reading to find out what happened.

Loved, loved, loved this book. Dan Lockhart and Lexi Green are great characters that I really took to. I can tell their mutual attraction, coupled with the emotional baggage they carry with them, is going to make for a brilliant thread through their upcoming stories. The murders were excruciatingly painful and it's a very warped mind that comes up with such an unusual and unique way to kill someone. I can only thank all my gods that Chris Merritt chose to write about it rather than act upon such a barbaric idea! Tightly woven with great dialogue and pithy prose, this story will keep you up way past your bedtime, needing to read just one more chapter. Can't wait to get my teeth into book 2. A definitely 5 star, highly recommended from me.

I'd give this book five stars even though it seemed really heavy on the Police Procedural genre and it was quite long. The plot was brilliant and the characters even more so. The serial killer was a completely different kind of killer, not the usual abduct, stab, kill but one with depth and an original way of committing murder. I would recommend CM as an author because I think he has an original voice and I will definitely be reading more of his books.

Detective Dan Lockheart is called to investigate the brutal murder of a young successful woman, but he recognises the murderers MO, a few months earlier, another young woman - this time a sex worker - was found murdered in similar circumstances. Both had died due to asphyxiation, from a metal ball being forced down their throats.
Dan’s superiors don’t entertain the thought of a serial killer and mark it firm as a copy cat killing. Dan isn’t convinced and when a third woman is killed, he calls in the help of Dr Lexi Green, a psychologist who he sees on a regular basis helping him come to terms with among other things, the sudden disappearance of his wife. Lexi is convinced the answer lies online, in the forums and chat rooms she has discovered, but without the backing of Dan and his colleagues, she goes it alone. Will she uncover the identity of the so called Throat Ripper before he strikes again?
Great book and I have requested to be approved to read the next in the series. Looking forward to it!

This book was really good! Enjoyed it and would recommend! First time reading this author and will now keep an eye out!

I don't like answering the door at the best of times...after reading this I definitely wont be. I really enjoyed this book. It was well paced and didn't take too long to get to know the characters. With most new series I find the first book good but get bored sometimes getting to know the characters. I enjoy the dynamic between DI Dan Lockhart and psychologist Lexi Green and I am looking forward to reading the next instalment.