When busy trainee-doctor Alison Hewitt from Sussex joined a dating agency in 2010, she had no idea that her actions would set in motion a terrifying chain of events that would threaten lives. The man she thought she was meeting was a respectable Canadian businessman called Al Amin Dhalla. Alison's mother Pam grew suspicious of the man who seemed to harbour many dark secrets. Pam turned Miss Marple, hired a private investigator to find out more and soon realised that Dhalla's entire life story was based on lies. It was only when Alison finished the relationship that the real Dhalla emerged and he started a campaign of terror against her as he sought revenge for what he saw as the ultimate betrayal. This documentary tells the story through interviews with Alison, her family and police officers, along with footage from surveillance operations and CCTV cameras.