Eve of the Serpent

For a crust to keep her alive, Prytani will tell your future: for when she merges with her little vixen Tamesis, she can journey into the underworld.
Her own world is one of towers on glass hills, ships who steer themselves, swords that sing, mermaids and werewolves, all of it about to be shattered by the arrival of a boy hardly older than herself.
Worse still, others seek to utilise her talents to control the Dead Legions – who are already encroaching on the world of the living.