John,
Going to London for a fortnight. Don't follow.
-Crowley
Angel,
Going to London for a fortnight. Don't follow.
-Crowley
Seto,
Going out of town for two weeks. Here's the key to my office.
-Crowley
((Attached is the key.))
Letters sent, Crowley picked up the phone in his office* and disappeared.
*He assumed that any office he had would have an operating telephone, so it did.