Based on Harlan Coben's New York Times bestselling novel, the eight-episode series, "Stay Close" follows three people living comfortable lives who each conceal dark secrets that even the closest to them would never suspect; Megan (Cush Jumbo), a working mother of three; Ray (Richard Armitage), the once promising documentary photographer, now stuck in a dead-end job pandering to celebrity obsessed rich kids, and Broome (James Nesbitt), a detective who's unable to let go of a missing person's cold case. Lorraine (Sarah Parish), an old friend from Megan's past, delivers some shocking news which will impact on all three characters. As the past comes back to haunt them, threatening to ruin their lives and the lives of those around them, what will be their next move?