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Avra Helvaçi, former field agent of the Araşti Ministry of Intelligence, has accidentally stolen the single most expensive secret in the world—and the only place to flee with a secret that big is the open sea.

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To find a buyer with deep enough pockets, Avra must ask for help from his on-again, off-again ex, the pirate Captain Teveri az-Ḥaffār. They are far from happy to see him, but together, they hatch a plan: take the information to the isolated pirate republic of the Isles of Lost Souls, fence it, profit. The only things in their way? A calculating new Araşti ambassador to the Isles of Lost Souls who’s got his eyes on Avra’s every move; Brother Julian, a beautiful, mysterious new member of the crew with secrets of his own and a frankly inconvenient vow of celibacy; the fact that they’re sailing straight into sea serpent breeding season and almost certain doom.

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But if they can find a way to survive and sell the secret on the black market, they’ll all be as wealthy as kings—and, more importantly, they’ll be legends.