I'm Heather

Heather is having a secret affair with Terrance, the man she sets up with her best friend, Paige. When Terrance and Paige fall in love, Heather's jealousy turns into a deadly obsession. She murders Paige, her own husband Kevin, and it's revealed she also killed Terrance's ex girlfriend. After kidnapping Terrance, she is arrested, only to be released from a mental institution years later, still obsessed and promising to find him.