Sorry, Wrong Number

In New York, Leona Stevenson is the invalid wife of the VP of a pharmaceutical industry Henry J. Stevenson and becomes aware of a murder that would be committed late night of that day through a "cross-wire", when she overhears two men planning the murder. Leona tries to find the right number to tell the police and she discovers that her former friend and ex-girlfriend of Henry, Sally Hunt Lord, had lunch with him. She recalls the first encounter with her husband and parts of her life with him through flashbacks. Along the night, she learns dirty secrets about her husband Henry as she attempts to find the intended victim.