Eivy has survived in the Greybor underworld since she was orphaned. She gets the chance to board the Red Stone, the ship of a fearsome pirate known for his red stone tooth that makes him invincible, and jumps at the opportunity to find her place in the world. She meets Kiam, an orphan like herself, who was raised by the Zabelins, mischievous creatures now persecuted on their own island. It is there that the mysterious map the pirate captain is hunting is hidden. But the terrible Jouko, a ruthless pirate, also covets the map and will do anything to get his hands on it.

Soon, thanks to her encounter with the seductive Ako, who seems to know a lot about her, Eivy understands that she will not find her place in this world. For the map will take her far beyond the seas she knows, in search of her own past, in search of the rift leading to Thea, a mysterious other world from which her parents may have come.

Unfortunately, they are not the only ones looking for her, and the demon chasing them seems bent on preventing them from crossing over.