Velvet Hands (1979)

Engineer Quiller made a fortune selling unbreakable shop-window glass to jewelers worldwide, but his invention made powerful enemies: insurance companies losing clients and burglars losing work. After an accident leaves him temporarily voiceless and memoryless, a family of thieves takes him in, convinced he's a fellow pickpocket. Complications arise when Quiller falls for his caretaker, Tilli, blurring the line between love and deception.