As I've said in earlier posts, this shows Houdini and Bess visiting the set of an Al Christie comedy at Universal Studios on December 13, 1915. Houdini is "trapped" by the Christie Girls. He's then freed on Bess's command. It's a rarely seen, wonderful piece of film credited as coming from the Larry Weeks collection.
For more on Universal history, I highly recommend Antonia Carlotta's YouTube Channel Universally Me. Her great uncle was Universal's founder, Carl Laemmle. Antonia also appeared in the 1997 Goodspeed Opera House's play, Houdini, which she mentions in her video, Why'd the World Forget Rosabelle Laemmle?