After breaking the family curse, the Widdershin sisters can leave their prison, Ravenstone Island. But the brothers have a special flair for finding adventures, so when a mysterious girl arrives in Zsivány Zseb, they get into yet another complication. After a while, Charlie loses his trail, and Betty and Fliss's journey with ferocious pirates, a haunted shipwreck and a hint of witchcraft leads to a mysterious island. Who could have kidnapped their sister and will they find her before it's too late?