Spenser: For Hire (1985)

S1E16 When Silence Speaks

A deaf woman enlists Spenser's help to track down a man she had been exchanging letters with, who has suddenly vanished. As Spenser digs deeper into the case, he uncovers connections between the missing man and a group of thieves. This gang is now seeking vengeance against Spenser for disrupting their diamond robbery, putting his life in danger as he continues his search.