This is Robert Crais's latest Elvis Cole novel, and it's pretty good. Elvis has mostly recovered from his breakup with his true love, Lucy, and also getting seriously shot up a couple books back. So he's back to being the World's Greatest Detective. (It's not clear whether he inhabits the same universe as Spenser; in that case, he'd be the World's Greatest Detective, Except Possibly For a Tie in Boston.)
As the book begins, Elvis is getting threatening phone calls. Worse, a couple of cops show up asking about an old case where he was able to exonerate a sleazeball on a murder charge. Now, it appears very much as if the sleazeball was guilty of that murder, and a number of others. Can the World's Greatest be losing his touch?
Not likely. Elvis takes it upon himself to figure out what's going on.
A number of characters from previous books show up: the resourceful and taciturn Joe Pike, and cop Carole Starkey, who's seriously in love with Elvis. (Neat writer's trick: although Elvis is the book's narrator, and the narration makes Starkey's feelings for Elvis obvious, Elvis himself remains oblivious to it.)