Menin Gate at Midnight, Will Longstaff, 1927.
"At the landing, and here ever since" - Anzac Book, p. 35.
So the Uberplay rules state:
"If no player put on an exhibition that round, the Thieves leave the Castle empty handed."
In this case do they leave the castle, and therefore do not get arrested? Or does is the "leave the Castle empty handed" just being clever, and they do go to jail? The Detective section points out that thieves go to jail whether or not they stole, but this can happen with say one exhibitor and four thieves, with a three card exhibition.
It's just an expression, if caught by a detective, they still go to jail. Either way [jail or home], they're 'leaving' the Castle.