Ian Ianson has never spent the night away from his parents, so he is super-nervous about the upcoming Year 6 school trip to Leviathan Hall, a mysterious old stately home.

Thank goodness his imaginary friend, Remington Furious III, will be accompanying him.

But the trip takes a sinister turn when Ian discovers the truth about Gertrude, the creepy owner of Leviathan Hall, and her evil plans for Ian and his class.