Mortal Gods Series by Francesca Simon

Freya is an ordinary girl living in modern Britain, but with a twist: people still worship the Viking gods. She's caught in her parents' divorce, and shuttling between bickering adults is no fun. One evening, stuck with her dad on his night shift at the British Museum, she is drawn to the Lewis Chessmen and Heimdall's Horn.

In The Sleeping Army, Freya went to Hel and back. She fought dragons, fled fire and outwitted giants - all to restore eternal youth to the Norse Gods. But now they're back, does anyone care?Up in Asgard, it doesn't really feel like it. The Gods' popularity on earth is waning, and without regular worship, their powers are fading fast. Meanwhile, their ancient enemies, the Frost Giants, are stirring... moreIn The Sleeping Army, Freya went to Hel and back. She fought dragons, fled fire and outwitted giants - all to restore eternal youth to the Norse Gods. But now they're back, does anyone care?Up in Asgard, it doesn't really feel like it. The Gods' popularity on earth is waning, and without regular worship, their powers are fading fast. Meanwhile, their ancient enemies, the Frost Giants, are stirring. So the Gods hatch a plan - they'll come back down to earth, and they'll pursue a very different kind of popularity. They're going to become celebrities. A rollicking, thrilling and hilarious ride, The Lost Gods takes up where the Sleeping Army left off and takes us back to Simon's brilliantly-imagined modern Norse England. less

A stunning, operatic, epic drama, like no other. Meet Hel, an ordinary teenager - and goddess of the Underworld. Why is life so unfair? Hel tries to make the bets of it, creating gleaming halls in her dark kingdom and welcoming the dead who she is forced to host for eternity. Until eternity itself is threatened. Francesca's first and wonderful foray into teen.