Everybody Comes to Rick's

Mysterious city of sin and intrigue! Sherlock and John meet again in Casablanca.

‘He plays that bloody song all the time,’ John said with a half-choked laugh, pulling a pack of cigarettes out of the inside pocket of his jacket. He extracted two and lit the both of them, handing one to Sherlock without looking at him.

Crossover with Casablanca (1942).