Josie Davis' movie MY STEPDAUGHTER'S SECRET (working title, ex A Murderer Upstairs) will be premiering on LMN on May 11, 2017 at 8:00PM ET/PT!
Cast: Josie Davis, Tiera Skovbye, Cameron Bancroft, Ali Skovbye.
Synopsis from Lifetime' press release:
Cindy (Josie Davis, Accidental Obsession) tries to protect her stepdaughter Rachel (Tiera Skovbye, Riverdale) after she witnesses the murder of her best friend, but is soon forced to come to grips with the terrifying possibility that her daughter may be the real killer! My Stepdaughter's Secret also stars Cameron Bancroft (UnREAL).
Update #1, April 22, 2017:
Movie page on mylifetime.com