For all the years that Randy Susan Meyers counseled male batterers, there was one question that stuck with her. “What about the children?’’ she wondered. “They were sleeping’’ during the violence was the batterers’ frequent refrain. Yet Meyers knew that violence in the home reverberates beyond the dark of night. Meyers started writing, drawing on her familiarity with the world of batterers to produce a story that could have been ripped from the day’s headlines. Her debut novel “The Murderer’s Daughters’’ (St. Martin’s) is a gripping tale of sisters Merry and Lulu struggling for 30 years to find their way in the world, one devoted to their imprisoned father, the other enraged at him.