Missing You, by Harlan Coben
Warning: under no circumstances do you skip to the ending of this superbly crafted novel. Yes, there is a twist – are several of them, in fact. And you have to work your way through all of them to relish the stinger on the final page. Kat Donovan is a New York cop, daughter of a cop, raised in the stiff Irish Catholic world of cops. Once, she almost escaped, to Columbia Law School and marriage to a highly eligible man. Everything collapsed when her father died, murdered on the job in a contract killing. The murderer confessed and went to prison for life, but the crime boss who commissioned the killing is still free and easy. Catching him is Kat's obsession. Then one day, she goes on a dating website and, after 20 years, there's the man who stole her heart and ran away with it. All that is just in the first few pages of this terrific book. The story sweeps in time and place and keeps moving. There's a contemporary plotline too, the hunt for a missing woman that dovetails neatly into Kat's obsessive search for the clue that will release her from her father's death. One of Coben's best ever.