CARTER AND SADIE KANE, descendants of the magical House of Life, are in pretty big trouble.

Despite their bravest efforts, Apophis, the giant snake of Chaos, is still threatening to plunge the world into eternal darkness. Now the Kanes must do something no magician has ever managed - defeat Apophis himself. No pressure there then.

Battling against the forces of Chaos, their only hope is an ancient spell - but the magic has been lost for a millennia. Will they find the serpent's shadow, or will they be led to their deaths in the depths of the Underworld?

An all-new collection of short stories from the world of Magnus Chase!

Travel the Nine Worlds with your favourite characters from the world of Magnus Chase in a brand-new series of adventures.

Find out why Amir Fadlan hates clothes shopping in Midgard, see how Mallory Keen learns in icy Niflheim that insulting a dragon can be a good idea, and join Alex Fierro as they play with fire (and a disco sword) in the home of the fire giants, Muspellheim.

But watch out for Thor, who is jogging through all Nine Worlds so he can log his million steps - and is raising quite a stink . . .