Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Tightly plotted thriller

This book is the third in a series featuring Kate Martinelli--a homicide detective in San Francisco. When Kate's lover, Lee, goes off to the Pacific Northwest to recover from serious injuries, Kate feels sorry for herself until she befriends Jules, a friend's daughter. She becomes involved in many searches for children---at the job, helping find Jules' homeless friend, Dio, and finally when Jules herself disappears while on a trip with Kate. This is a hard book to put down, particularly with the plot twists, including the possibility that Jules could have been kidnapped by a notorius serial killer. I enjoyed it but was somewhat disappointed by the unresolved issues between Kate and Lee at the end of the book. But then this is an incentive to read the next installment.