Almost a year after the events of Ghost Walk, autumn has descended on the beach-side city of Levien. It's almost Halloween, which means decorations are going up, the leaves are turning, children are dressing up in costume, and the city's ghosts are getting a kick out of everyone dressing up as the dead.
Maaya and Adelaide are busy preparing for a special Halloween trip out at sea, but before they can get too far, two strangers arrive at their door claiming they have a job that only the girls can do. The strangers explain there have been stories of a shipwreck far out at sea around which sailors report hearing strange noises and voices. Some even say their ships have been damaged, pointing to what look like long claw marks on their ships' hulls.
With this new danger threatening sailors in the world they just saved, Maaya and Adelaide take the LSV Windfire along with some new guests to investigate. As they do, they begin to realize the situation they're in seems awfully and frighteningly familiar.