A sister and her disturbed twin are implicated in a murder and a police detective must figure out which one's the killer. A sister and her disturbed twin are implicated in a murder and a police detective must figure out which one's the killer. A sister and her disturbed twin are implicated in a murder and a police detective must figure out which one's the killer. A sister and her disturbed twin are implicated in a murder and a police detective must figure out which one's the killer.