Her Alibi (1989)

Although he's the author of a number of best-selling mysteries, Phil Blackwood (Tom Selleck) hasn't written a book in four years, and his writer's block is becoming painful. In the hope of finding something to spark his imagination, he heads for the local courthouse, where he becomes instantly infatuated with a stunning Romanian woman, Nina Ionescu (Paulina Porizkova), who has been charged with murder. Eager to overlook this possible character flaw, Phil disguises himself as a priest and smuggles himself into the jail, where he offers to let her stay at his house and provide her with an alibi. Once Nina gets out of prison, though, she begins to test Phil's good faith. At his Connecticut house, a group of Romanian spies make several attempts to murder the couple, finally blowing up the writer's house. When a number of the guests at a dinner party they're attending become ill, Phil believes that Nina has tried to poison him and everyone else. Although this proves false, he's still not really comforted by her well-developed skill at knife-throwing.