When Ricky Reyes dares Jeffrey to get a bloody dagger out of the old McGyver house on Halloween night, Jeffrey is counting on Max, his ghostly friend, to help him.

Bill and Megan Stine have written numerous books for young readers, including titles in these series: The Cranberry Cousins; Wizards, Warriors, and You; The Three Investigators; Indiana Jones; G.I. Joe; and Jem. They live on New York City's Upper West Side with their seven-year-old son, Cody, who believes in ghosts.