Knock

In sleepy Santa Rosa, restless young Charlie’s world brightens when her sophisticated Uncle Charlie arrives for a long visit. But as his behavior grows increasingly strange, she begins to suspect that her beloved uncle may be hiding a terrible secret—and that danger has quietly entered her home.

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

A routine investigation of a shocking murder takes a bizarre twist when the killer contacts the reporter and appoints him his personal spokesman. As the killer's calls and clues increase, the reporter is lured into a deadly trap.

Julia Ross secures employment with a wealthy widow and goes to live at her house. Two days later, she awakens in a different house in different clothes and with a new identity.