To Become One on AllMovie

Exactly one year after her mother was ruthlessly slaughtered by a homicidal maniac, a young girl named Melinda is terrified to discover that the killer has returned to finish the job by murdering her family, her friends, and everyone she holds dearest. Now, as Melinda's friends and family all fall prey to a masked madman, the list of suspects grows smaller and a long-buried family secret finally comes to light. Could it be that the killer is actually Melinda's Siamese Twin, separated at birth and determined to rejoin his sister even if it means shedding the blood of the innocent?