Murder at Midnight: DI Hillary Greene Book 15

Felix Olliphant was found stabbed to death at a New Year's Eve costume party for the turn of the millennium.
Seemingly liked by everyone, motives for his murder are hard to find. There was one suspect, but no evidence.
Hillary struggles to solve this baffling case. And she has to contend with a new colleague, Jake Barnes. Young and rich, he says he wants to give something back to the community, but Hillary has her doubts.
Will Hillary finally be defeated by this cold case and will she lose her boss and love interest to a new job?
Hillary Greene has returned to Thames Valley Police HQ, acting as a cold-case consultant for the Crime Review Team, looking into murders which the police have never been able to solve.
She wasn't sure she wanted to go back. But solving crimes is irresistible for Hillary Greene. And it doesn't hurt that her new boss is devastatingly handsome.
This is a crime mystery full of well-observed characters, which will have you gripped from start to the absolutely thrilling conclusion.