Excerpting from my long-form review at the link given:

Fans will not be disappointed. We have a reluctant hero, a feisty female co-adventurer and love interest, and the return of the Big Bad. Cliffhanger ending.

This here's a fightin' book. There are sea-battles, and jungle battles, and some nifty gadgety weapons. You know that scene with Q in every Bond movie? That happens, only with a sort of repeating-rifle-cross-bow thing. There's a sea monster in the southwest Pacific that's somehow connected to a dude in Boise. There are feuding islanders in an uneasy truce, led by Prince John and an eccentric female explorer-adventurer-quasi-royalty from Australia and England (Pip). There's a lot going on in this book.