This was one of my favorite guilty-pleasure films of the early 70s. I've beeen waiting for decades for its release on VHS or DVD.
It's still fresh, stylish, funny, fast, clever, smart and, most of all, seamless in its ingeniously circular plot. With a hot-colored 70s backdrop. it has surprisingly naturalistic performances given the winking nature of the plot. And it captures the thrills of the thriller genre as well as any of the "real" ones from this era.
It's all in fun, especially the embedded musical-within-the-movie, also called "The Crook."
After the first viewing, you'll find yourself going back to try to find how the movie comes back on itself. Good luck!