Dark Hollow is the second book in a series of detective novels following a particularly interesting character, Charlie "Bird" Parker. Parker's an ex-cop whose wife and daughter were horribly killed. He left the department as a result, and after flirting with alcoholism gave up the bottle. In the aftermath of that, he became a private detective, and these first two books describe what came of that, so far.
In this particular story, Parker has moved to his ancestral Maine to live, trying to get away from the city. He's asked by a friend to find her ex-husband, and see if he will cough up some child support, but the money that the ex gives Parker turns out to be connected to a bizarre three-way shootout on a nearby beach that happened a few days before. Someone wound up with two million dollars that the mob thinks is theirs, and they're not going to stop looking for it. Meanwhile, the ex-wife and her toddler son are killed in a bizarre fashion, a pair of crazed hit men show up bent on some strange sort of revenge against Parker, and in the background somewhere there's a ghost from the past, a killer half-spoken of, half unseen for more than thirty years. Add to this mix Parker's two friends, ex-burglar Angel and his gay lover semi-retired hitman Louis, and an old girlfriend of Bird's, and that's just the beginning of the book.
Connolly apparently has this as a pattern or style now. These books have murky, dark plots, laden with atmosphere. I think he could make Hawaii look dark and forbidding if he wrote something set there. There's connections to crimes past, interesting characters intermingled in a bewilderingly complex plot, snappy dialog, and a body count that makes the Battle of Stalingrad look like a tea party. I enjoy this sort of thing, and enjoyed this book a great deal. Be warned though: enter at your own risk.