You Might Be the Killer (2019)

Slasher film expert gets called in to solve a massacre at summer camp 

Sam is stuck at a summer camp where his fellow counselors are being picked off in a crazed murder spree. He calls in his friend Chuck, a horror movie buff and comic book store manager, to help make sense of what’s happening before the killer gets to him. But in true horror movie fashion, there may be a twisted logic to the plot that only Chuck can unravel—which means anyone could be the killer—including him.