Becky.

Newly married couple, Greg and Joy Lawson, move into their home in the suburbs and are warmly welcomed by their neighbors, one of whom, Becky, takes a dangerous interest in Greg. While Joy is away, they spend an intimate moment together, orchestrated by Becky, and then they agree to keep their distance. But she inserts herself into every aspect of his life, wreaking havoc on his marriage and potential job until the final explosive confrontation.