Michael Patrick MacDonald, whose memoir All Souls: A Family Story from Southie was a popular success for Beacon and then as a Ballantine paperback, is moving to Houghton Mifflin with a new memoir that picks up where the last one left off. Senior editor Deanne Urmy, who had originally published MacDonald at Beacon, bought world English rights from agent Ike Williams at Kneerim & Williams for publication three years hence. MacDonald's earlier book told of his horrific childhood in a 1970s South Boston neighborhood crippled by racism, gangsters and corruption. The new book, tentatively titled At Risk, describes his efforts as a teenager to find a livable world outside the projects where his family had moved in the '80s.