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Acclaimed author Lian Tanner's Icebreaker was shortlisted for Australia's Aurealis Award for Best Children's Book. Here 12-year-old Petrel is an outcast surviving in the shadows aboard the Oyster, a 300-year-old icebreaker. Risking everything to save a frozen boy found adrift, Petrel quickly uncovers the disturbing truth about both the ship and a secret mission of death and destruction.

Sharkey was born on a fortunate tide, and everyone on the giant submersible Rampart knows it. He's a hero, a future admiral, beloved by the ancestors. The trouble is, it's all based on a lie, and now that Sharkey is 13, the whole thing has begun to fall apart. He's been a fake hero for years, but when tragedy strikes, he must become a real one. And he has no idea how to go about it....