Trembler's real name is Theophilus Molloy, but everyone calls him Trembler, a nickname given to him by his previous associates. He works for Frederick and Rosa in their photography shop. Trembler was once an unsuccessful pickpocket, and Fred found him when Trembler tried to pick his pocket one day. Frederick stopped him, Trembler was relieved, and since then he has been happily working for the Garlands. The Garlands treat him as a friend rather than a servant, and he seems to be part of the family at Burton Street. He is very loyal to Frederick and Rosa and seems to love them dearly. He quickly befriends Adelaide when she comes to stay with them, becoming something of a surrogate father to her. He is kind, patient and friendly, but often very nervous, which is how he got his nickname.