Mr. Jack Pocket: Extension, the first expansion for Mr. Jack Pocket, features three new characters and a new detective: Mycroft Holmes with a special ability. With three new alibis, the game will be played on a large London consisting of twelve areas (street tiles) instead of nine as in the base game. More suspects? The investigation looks harder... Fortunately a new detective comes to lend us a hand: Mycroft, the famous brother of Sherlock Holmes! —description from publisher