Secrets Unlocked

Plot
With all the clues coming together, the group finally figures out the trail to finding the key to the school's past, but not before getting through the authorities believing they had something to do with the murders.

Main

 * Gregg Sulkin - Russel Carswell
 * Alycia Debnam-Carey - Kimberly McPhee
 * Erinn Westbrook - Diane Copeland
 * Jeremy Irvine - Peter Campbell
 * Nicholas L. Ashe - Miles Jenner
 * Erin Moriarty - Charlotte Hollands
 * Amanda Setton - Ms. Jeanie Moss
 * Michael Xavier - Harold Jones
 * Clara Wong - Ms. Kira Hoo
 * Ed Weeks - Professor Jerry Timms
 * Joe Knezevich - Professor Jonathan Val

Recurring

 * Jake Allyn - Josh Carswell
 * Jeanette Dilone - Simone Daily
 * Holly Deveaux - Lauren Jones
 * Candice Patton - Claire Copeland
 * Ruben Santiago-Hudson - Det. Charlie Harris
 * Olivia Williams - Deputy Lillian Wilson
 * Merle Dandridge - Det. Una Rivers
 * Dylan Minnette - Ian Wright
 * Mackenzie Leigh - Sarah Jones