NEW YORK TIMES BESTSELLER - In this funny, winning, and unexpected adventure from the New York Times bestselling, National Book Award-winning author of the Penderwicks series, a girl finds herself an unlikely hero when she stumbles upon a big secret about little creatures.

"A tender story whose tone evokes the warmth of a much-needed hug."--Publishers Weekly, starred review

Gwen MacKinnon's parents are dreadful. Truly, deeply, almost impressively dreadful. So Gwen's not upset at all when she's foisted onto her never-before-seen Uncle Matthew for two weeks. Especially when it turns out he has a very opinionated dog named Pumpkin.

Things take a turn for the weird when Gwen makes a discovery in the local library. A discovery that involves tiny creatures with wings. And no, they're not birds. They're called Lahdukan. But why can only Gwen and the youngest children, gathered for storytime, see them?

The Lahdukan insist that Gwen is destined to help them find a new home. But how can a girl as unwanted, uncourageous, and generally unheroic as Gwen possibly come to the rescue? Pumpkin has a few ideas...