American businessman Brad Hunter and his wife Suzy are visiting England for the first time. Meeting a business contact, Brad introduces his wife as "Theresa". But it seems to be more than an innocent slip of the tongue. Brad begins behaving strangely and knows more about specific locations in London than he would as a first-time visitor. Suzy hires private detective Matthew Earp to look into the reasons behind her husband's sudden change in personality.
—L. Hamre