First, Southampton Books, a spanking-new shop on Hampton Road in that village, was worth visiting for its rare books section, a rare thing hereabouts. Now comes the pull of author appearances — readings, signings, Q&A, you know the drill. The series opens on Saturday at 4 p.m. with Matt Marinovich and “The Winter Girl,” a psychologically rich tale of a disintegrating marriage, a dying S.O.B. of a father, an unnerving house next door, and, perhaps darkest of all, a bleak winter in Shinnecock Hills.