Secretly a Serial Killer (2021) is a Horror, Action film that follows a teenager and his buddy decide to surprise their friend by showing up at his house one day. Little do they know, their friend harbors a dark secret which may change their lives for good... Secretly a Serial Killer is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 10.0 out of 10 from 1 votes. Fans of horror movies may also want to explore similar titles below.