Linus Baker is a fictional character from the novel "The House in the Cerulean Sea" by TJ Klune. He works as a caseworker for the Department in Charge of Magical Youth, where he evaluates orphanages that house magical children. Linus is known for his strict adherence to rules and his dedication to his job. Throughout the story, Linus embarks on a journey of self-discovery as he visits an orphanage on a remote island. There, he meets a diverse group of magical children and their caretaker, Arthur Parnassus, which challenges his perceptions and beliefs about magic and acceptance.