Instruct: Classify Amazon reviews into positive or negative sentiment
Query: entertaining

Whistleblower is Tess Gerritsen's 5th stand-alone novel. When Victor Holland runs in front of Cathy Weaver's car on a lonely California highway, she takes him to the local hospital, aware that he seems to be terrified, but unaware that he has been shot. While his ravings seem to be paranoid, the murder of Cathy's close friend, followed by several other murders, has Cathy not just believing Victor, but depending on him for her own safety. What follows is a rollercoaster ride of pursuit and evasion as Cathy and Victor try to prove what he has uncovered without losing their lives. Plenty of action along with some romance makes this an entertaining read.