Information for Sherlock Holmes and A Christmas Mystery at Everyman Theatre, Cheltenham (Play). Found at the corner of Goodge Street: a goose and a black felt hat... The great mind of Sherlock Holmes can find no time to rest, even at Christmas. Join Holmes and Watson on a riotous goose chase around wintery London. Can the infamous duo connect the dots between a lost hat at one end of town and a rifled jewel case at the other - or can you crack the case first?