The final Houdini séance was held on October 31, 1936 (the tenth anniversary of Harry Houdini's death), on the roof of the Knickerbocker Hotel in Hollywood. Nearly 300 invited guests formed the outer circle, with 13 special guests (including scientists, occultists, reporters, magicians, and spiritual leaders) joining Mrs. Houdini in an inner circle.

This documentary recording is narrated by George Boston. Bess Houdini also speaks.