Mark of a Killer (2019)

S2E1 Killer Caller

Title: The Confession Caller Plot: In the Twin Cities, MN, law enforcement is on the trail of a mysterious voice behind a series of chilling murders. The perpetrator, with a hauntingly high-pitched tone, reveals his crimes over the phone, pleading for absolution. Despite the terror he instills, his identity remains a mystery—until one woman manages to escape a vicious assault. Her survival may hold the key to uncovering the truth behind the killer caller.