There's never a good time to find a dead body. But finding a dead body while you're trying to kiss your crush? Dead awkward. All Kerry wants to do is stay at home with her rom-coms and strict retainer schedule. Instead, her BFF Annie has roped her into going to their first sixth-form party to investigate who's cyberbullying Heather, the most popular girl in school. On the cusp of kissing her dreamy crush, Scott, Kerry discovers the body of Heather's second in command - suffocated with a menstrual cup. Within days, another student turns up dead, this time with a sanitary pad across the eyes. Now Annie and Kerry are officially on the case to stop the menstrual murderer - period.