As Dan tries to end the affair and return to his wife and daughter, Alex's obsession grows, leading to a series of escalating and terrifying events. Meanwhile, Dan's wife, Beth (Bonnie Bedelia), becomes suspicious of his activities and starts to investigate.

: Dan's affair with Alex sets off a chain of events that can be seen as traumatic for all parties involved, demonstrating how a single act can have profound psychological effects.

Interestingly, the script underwent significant tonal shifts during development: 10 Screenwriting Tips from FATAL ATTRACTION - ScriptShadow

The Unwritten Page: The Search for the Fatal Attraction Script and the Making of a Cultural Landmark