A girl called Corpse

 
With no memory of the kid she was before she was taken by the Witches, Corpse is bound to haunt the rock-that-doesn't-exist forever. Until she learns of a treasure, one that can reunite Corpse with her family and her name. She must set off for answers, on a journey across the stormy sea, battling magic, zombie-skeletons and monsters. But the Witches want the treasure too. And they'll do anything to get to it first.