Half Moon Bay by Alice LaPlante
Jane O'Malley loses everything when her teenage daughter is killed in a senseless accident. Devastated, she makes one tiny stab at a new life and moves from San Francisco to the tiny seaside town of Half Moon Bay. As the months go by she is able to cobble together some possibility of peace. Then children begin to disappear, and soon Jane sees her own pain reflected in all the parents in the town. She wonders if she will be able to live through the aching loss, the fear once again surrounding her, but as the disappearances continue, fingers of suspicion all begin to point at her.