Dark be the water, and darker still the creatures that lurk within... Free-spirited Isla Blackwood has never accepted the shackles of her family's nobility. Instead, she sails the open waters, searching for belonging on the waves. But when tragedy calls Isla home, she realises she can no longer escape the duty she's been running from. Selkie raiders have been terrorising the island's coasts, and when they strike at Blackwood Estate, Isla is forced to flee with her hot-headed brother and brooding swordmaster. To avenge her family and reclaim her home, Isla will have to set aside old grudges and join forces with an exiled selkie searching for a lost pelt. The heirloom might be the key to stopping the bloody conflict-but only if they can steal it from the island's most notorious selkie hunter, the Grand Admiral himself. Caught between a promise to the brother she once left behind and an unlikely friendship with the selkie who should have been her enemy, Isla soon realises the open seas aren't the only treacherous waters she'll need to navigate. As enemies close in on all sides, she must decide once and for all where her loyalties lie if she wants to save what's left of her family-and find the belonging she's been searching for.