You Might Be the Killer (2018)

While in a panicked state at Camp Clear Vista, lead counselor Sam calls his friend Chuck, a horror movie enthusiast working at the Rings of Saturn comic book shop. Sam explains that a masked murderer is loose on the campgrounds and has killed "a lot" of counselors. Chuck asks Sam for more details. Sam begins recounting his first day at the camp with fellow counselors including Carol, Ted, Steve ‘The Kayak King,’ Drew, Alice and Heather, Sam’s ex-girlfriend Imani, Freddie, Nancy, Brad, and Jamie.
Sam suffers a momentary blackout while on the phone with Chuck. Sam escapes the cabin where he is hiding when someone sets it on fire. Sam briefly encounters the masked killer before finding a new hiding spot. Chuck calls back to help Sam deduce the killer’s identity. Sam recalls how he and several other counselors found themselves trapped at the camp after discovering several dead bodies. A flashback shows Sam stumbling upon Freddie and Nancy while patrolling the woods for the killer. For some reason Freddie and Nancy are unable to hear Sam. Sam begins suffering a blackout as he witnesses the killer slaughtering Freddie and Nancy.