Penguin Random House Children's UK

Eight-year-old Jack and his little sister, Annie, are playing in the woods when they find a mysterious tree house full of books. But these are no ordinary books . And this is no ordinary tree house . When the tree house lands in the freezing Ice Age, they have to hide from hunters and escape from a great cave bear.

Eight-year-old Jack and his little sister, Annie, are playing in the woods during their summer holiday, when they find a mysterious tree house full of books. But these are no ordinary books . And this is no ordinary tree house . . Jack and Annie are whisked into the future - to an exciting outer-space hotel!

After a break from their trips in the tree house, Jack and Annie are delighted to find that it's back! Morgan le Fay needs their help, but they'll have to become Master Librarians first, and that means solving four riddles. Jack and Annie ride in a mini-sub and meet jellyfish, sea horses and an octopus.

Magic can save you Magic can kill you It should be a time of celebration. A fellow student is callously murdered, and it seems Call's worst fears are confirmed: there is a spy in the Magisterium. No one is safe. Now, using the powerful magic they've been taught, the trio must risk their lives to track down the killer.

Callum Hunt's summer break isn't like other kids'. His closest companion is a Chaos-ridden wolf, Havoc. His father suspects him of being secretly evil. And, of course, most kids aren't heading back to school in the magical world of the Magisterium... It's not easy for Call...

The final, thrilling instalment in this extraordinary series from bestselling authors Holly Black and Cassandra Clare. A generation ago, powerful mage Constantine Madden came close to achieving what no magician had ever achieved: the ability to bring back the dead.

From the imaginations of bestselling authors Holly Black and Cassandra Clare comes a heart-stopping plunge into the magical unknown. Think you know magic? Think again. The Magisterium awaits .