Harry is sick when he's six years old, and gets a weird ear infection. When the pocket of pus in his ear pops, that seems to be the end of it. But then he notices that sounds trigger things in his brain. He will see and feel things that happened to people when he hears a noise made by the incident.
Harry doesn't know how to handle this thing, and when he gets older he starts drinking to numb it. Then one night Harry sees a drunk guy kick the shit out of some men planning to mug him. Once the men are all on the ground, the would-be victim takes their money.. and passes out.
This is Tad, a guy with his own problems. Harry and Tad become friends, start helping each other not drink. Tad also teaches Harry some stuff about martial arts that slowly helps Harry let the smaller sound-memories wash over him.
But trouble is waiting as Harry's love life turns to shit and his childhood love comes back to town and asks for his help.
This is a hell of a book, funny, violent, and really well-written.