Carol Higgins Clark went from typing her famous mom Mary Higgins Clark's manuscripts to following in her footsteps with her bestselling mysteries starring P.I. Regan Reilly. In our interview, Clark reveals some of her writing rituals, one of which is getting an early-morning start. "I think your brain is a little more creative at that hour, before the rest of the world is up," she explains. "You feel very virtuous!"