Detective Jane Rizzoli and forensic scientist Maura Isles are back together, and they will have to go deep into the wild to find the killer! Maura fears that this is not the first or last victim of the killer. Linking the crime to a series of unsolved murders in desolate forests across the country, she wonders if the answer lies in a remote corner of Africa. Six years ago, a group of tourists on safari fell victim to a killer. Lost deep in the Botswana bush, with no means of communication and only a guide's rifle for protection, terrified tourists desperately hoped for rescue before their worst instincts or the wild animals lurking in the darkness killed them. But the deadly predator was already among them, and within a week he was gone, killing all but one. Now this killer has chosen Boston for his new hunt, and Rizzoli and Isles must find a way to lure him out of the shadows and into his cage. Even if this means providing him with a bait that the hunter cannot refuse: the victim who was able to elude him.