Thorgal: Neokora (Thorgal #31)

The extraordinary Viking saga continues as Thorgal is forced to reckon with a mysterious and bewitching force... Thorgal, Jolan, Wolfcub, and the two children they rescued from the Selkie are sailing home when they come across a drifting ship. The crew is dead, but a strange, magical creature appears suddenly and attacks. That turns out to be the first in a series of bizarre events that will force Thorgal to return to a place with strong ties to his own past, as much to protect his family as to prevent terrible weapons from falling into the wrong hands...