Nurse's uncle had one.

It means you have to go back after a certain time, doesn't it ?" "Exactly," said Piers grimly.

"When the ticket expires." "But I don't see," began Jeanie.

Her face was flushed and a little distressed.

"How can hypnotism be like--like a ticket of leave ?" "I told you you wouldn't understand," said Piers.