Looking forward to a vacation, Katie, Lily, and Jasper attach their flying Gyroscopic Sky Suite to the Moose Tongue Lodge and Resort, where they mingle with other child heroes found in books, and where they become embroiled in a mystery involving lederhosen-clothed quintuplets and a screaming ventriloquist.

Men in dark hats sneak up behind you. Eyes on portraits follow you.
Even the flowers in their pots turn
to track you as you pass by.
Nothing is safe!
No one can be trusted!
 
Having mopped up their last crime-fighting caper, our three heroes—Lily Gefelty, Katie Mulligan, and Jasper Dash, Boy Technonaut—are eager to get home. But the secret police in the war-torn realm of fantasy where the three kids are trapped...