The Hashoone siblings - Tycho, Yana, and Carlo - are teenage privateers aboard their family's starship, the Shadow Comet, in a future where space is ruled by competing pirate clans. When their grandfather disappears while investigating a mysterious pirate faction called the Hydra, the siblings must take command and navigate dangerous asteroid fields, rival pirates, and family tensions to find him. Their hunt leads them to uncover a conspiracy that could change the balance of power in the entire Jovian system, testing their loyalty, courage, and what it truly means to be a pirate.