Amidst preparations for their upcoming wedding, Sierra (guest star Robin Givens) and Tom (guest star Martin Cummins) receive an unsettling message, which forces "The Midnight Club" to reunite. Meanwhile, Veronica (Camila Mendes) and Reggie (Charles Melton) take drastic measures to clean up a mess they created. Cheryl (Madelaine Petsch) learns some unexpected news about the college she has set her sights on. Lastly, Kevin (Casey Cott) gives Moose (guest star Cody Kearsley) an ultimatum.