One of the best action movies of that era, the 1970s. The actors are all first rate. Here's the IMDB link: https://www.imdb.com/title/tt0072251/ for those interested.

I grew up on Walter Matthau movies. He was such an unlikely action hero, but I loved watching him.

This is such a great time capsule movie. You can smell the cigarette smoke when you watch it. It also has the most perfect ending shot I've ever seen.