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Lil Potkin lives in the gloomy city of Peligan and dreams of doing investigative journalism. One day, while waiting in the waiting room at the bus station, Lil comes across a strange, sad boy and treats him to hot chocolate. When she wakes up at night, she finds him in her room. At first, the boy doesn't want to say who he is and where he came from, but eventually he confesses: he is a ghost, and he needs Lil's help. After all, the girl is the only one who can see him.

Lil Potkin and Ned Stubbs are eager to find out what happened to Nedley last year when he disappeared from the orphanage. The friends turn to Abe Mandrell, a retired detective, for help. Abe agrees to unravel the Stubbs case if Lil helps him find a dangerous criminal who has escaped justice.