Hamartia successfully blends time travel with reincarnation with the interesting concept that souls can be harvested. In the futuristic city of Hamartia, Grace Dartmouth learns that her nine-year-old son is afflicted with metagenesis, a disease in which a human’s soul is gradually leached from its body, leaving the body to die. To save Jordon, she journeys to circa 2000 Las Vegas to harvest the soul of her soulmate to implant into her son. There, she intersects with familiar souls hidden in new-to-her bodies. It’s a quick read as I was sucked right into the novel and hesitated to put the book down. The plot has numerous twists and turns, only one of which did I figure out in advance. Time travel and its consequences as well as the consequences of harvesting souls is explained in such a logical way that I was able to suspend disbelief. The world-building is excellent, too, and show clearly the difference between housing, transportation, etc, between 2000 Las Vegas and the future. The characters are well-developed and unique.