Mari Gilbert relentlessly drives law enforcement agents to search for her missing daughter and, in the process, sheds light on a wave of unsolved murders of young female sex workers on the South Shore barrier islands of Long Island committed by the Long Island serial killer. Starring: Amy Ryan, Thomasin McKenzie, Lola Kirke, Oona Laurence, Dean Winters, Miriam Shor, Reed Birney, Kevin Corrigan, Gabriel Byrne.