BoundBound (1996) is an American movie in the crime thriller genre, directed by the Wachowski brothers (of The Matrix fame). It stars Gina Gershon and Jennifer Tilly.
Warning: Wikipedia contains spoilers
The story revolves around the two main characters, Corky and Violet, and their attempt to steal 2 million dollars from Violet's Mafia-connected husband Caesar (played by Joe Pantoliano), whilst making him believe it was stolen by another Mafia member. There are numerous twists in the plot, as he and various other characters become aware that something unusual is going on.
Along the way, the couple form a strong lesbian relationship, and the film is often cited as one of the few movies where a lesbian couple experience a happy ending.