At M's disappearance, Holmes adjusts his coat and picks up his walking stick, tucking it neatly under one arm.

"Well gentlemen--and Miss O'Keefe, I believe--I look forward to making your acquaintances at a later date, when we have, I hope, more time available for leisure. However, my experiment will not wait, so I will bid you farewell until four hours from now."

With that, he turns to the door, pausing only briefly to seize the wrist of Arsène Lupin, pulling the man upright with surprising force.

"My dear Mr. Lupin. You, perforce, are coming with me. We have some things to discuss if we are to work together without betrayal of trust. Of course, if you decline...well, Scotland Yard is not far, and I will not let you escape a second time."