Staff arrived home on Friday afternoon and let the dog out as usual. Decidedly not as usual was finding Jeff waiting to come in at the back door.
After inspecting Jeff (fine, though dirty), Staff inspected the house and found the screen in the bathroom window had been popped out.
The other cats were present and accounted for, apparently lacking the courage to follow El Jefe out the window.
Jeff supervised as Staff applied a high-tech fix to prevent future breakouts.
Naturally this will only be effective until Jeff evolves opposable thumbs and/or a prehensile tail.