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If you trust her you'll never make it home...

Avery is an exceptional child. Everything he does is precise, from the way he washes his face in the morning, to the way he completes his homework - without complaint, without fuss, without prompt.

Zib is also an exceptional child, because all children are, in their own way. But where everything Avery does and is can be measured, nothing Zib does can possibly be predicted, except for the fact that she can always be relied upon to be unpredictable.

They live on the same street.

They live in different worlds.

On an unplanned detour from home to school one morning, Avery and Zib find themselves climbing over a stone wall into the Up and Under - an impossible land filled with mystery, adventure and the strangest creatures.

And they must find themselves and each other if they are to also find their way out and back to their own lives.

After climbing Over the Woodward Wall and making their way across the forest, Avery and Zib found themselves acquiring some extraordinary friends in their journey through the Up-and-Under.

After staying the night, uninvited, at a pirate queen's cottage in the woods, the companions find themselves accountable to its owner, and reluctantly agree to work off their debt as her ship sets sail, bound for lands unknown. But the queen and her crew are not the only ones on board, and the monsters at sea aren't all underwater.

The friends will need to navigate the stormy seas of obligation and honor on their continuing journey along the improbable road.

When the improbable road leaves Avery and Zib in the land of Air and at the mercy of the Queen of Swords, escape without becoming monsters may be impossible. But with the aid of the Queen's son, the unpredictable Jack Daw, they may emerge with enough of their humanity to someday make it home. Their journey is not yet over; the dangers are no less great.

Since stumbling from their world into the Up and Under, Avery and Zib have walked the improbable road across forests, seas and skies, finding friends in the unlikeliest of places and enemies great in number, as they make their way toward the Impossible City in the hope of finding their way home.

But the final part of their journey is filled with danger and demise. Not everyone will make it through unscathed. Not everyone will make it through alive.

The final part of the enchanting Up-and-Under quartet reminds us of the value of friendship and the price one sometimes pays for straying from the path. No-one's safety can be guaranteed under the smokestrewn sky.