The Unicorn returns with clear intent ... to make life unbearable for DI Simpkins!
Over the past eight years their game of cat and mouse has been tame compared to the one they're about to embark on. This time, the Unicorn, an underworld criminal, intends on destroying his nemesis, D I Lorne Simpkins. And those surrounding her.
In the process, Lorne puts her career and marriage to the ultimate test.
After being led into a trap in which her partner is killed, Lorne suspects she has a mole on her team, this would account for the Unicorn's ability to stay one step ahead of them for so long.
Revenge fuels the investigation. As she draws ever closer, the Unicorn decides to teach her a lesson by kidnapping Charlie, her teenage daughter.
Devastated by her daughter's plight and with her marriage in tatters, Lorne turns to Pathologist Jacques Arnaud for comfort.
Her state of mind is called into question and the Chief Inspector has no option but to remove her from the case.
Lorne sets out to rescue her daughter and bring the Unicorn to justice ...