Day of Atonement (Decker/Lazarus 4) by Faye Kellerman
Peter Decker of the LAPD never dreamed he'd be spending his honeymoon with his new wife, Rina Lazarus, in an Orthodox Jewish enclave in Brooklyn, New York--or that a terrible event would end it so abruptly. But a boy has vanished from the midst of this close-knit religious community, a troubled youth fleeing the tight bonds and strictures he felt were strangling him.
The runaway, Noam, is not traveling alone. A killer has taken him under his wing to introduce Noam to a savage world of blood and terror. And now Decker must find them both somewhere in America before a psychopath ends the life of a confused and frightened youngster whose only sin was to want something more."Kellerman is splendid."