Raveling — Peter Moore Smith

Raveling is a brilliant thriller about two brothers, their mother, and the sad fact of their little sister's unsolved disappearance twenty years earlier.

One of the brothers, Pilot, has come back home to take care of his aging mother, but his own mental state has not been stable since his sister vanished. He is determined at last to find out the truth -- but for every step he takes nearer the facts of that long-ago night, the less he trusts reality. And by the time he finds one incontrovertible piece of evidence, even Pilot cannot be sure what it really means.