Frasier (1993)

S9E3 The First Temptation of Daphne

Daphne discovers a file belonging to one of Niles' patients, who has developed feelings for him due to transference. This revelation triggers Daphne's insecurities, prompting her to go to great lengths to uncover details about the woman. Her growing paranoia leads her on a quest for information, as she grapples with the implications of Niles' professional relationships and her own feelings for him.