But Judy rips up the letter and continues the charade, because she loves Scottie.They begin seeing each other, but Scottie remains obsessed with "Madeleine", and asks Judy to change her clothes and hair so that she resembles Madeleine.After a rooftop chase, where his fear of heights and vertigo result in the death of a policeman, San Francisco detective John "Scottie" Ferguson retires.
Madeleine suddenly runs into the church and up the bell tower.
A flashback reveals that Judy was the person Scottie knew as "Madeleine Elster"; she was impersonating Gavin's wife as part of a murder plot.
Judy drafts a letter to Scottie explaining her involvement: Gavin had deliberately taken advantage of Scottie's acrophobia to substitute his wife's freshly killed body in the apparent "suicide jump".
The screenplay was written by Alec Coppel and Samuel A. The film stars James Stewart as former police detective John "Scottie" Ferguson.
Scottie is forced into early retirement because an incident in the line of duty has caused him to develop acrophobia (an extreme fear of heights) and vertigo (a false sense of rotational movement).