<p>After her first mission for the Fair Seas Treaty Alliance, Intelligencer Dagrun Lund returns home to find that her twin sister Inger has disappeared.<br />
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Using all of her skills as well as her strong Trait, Dag stows away on a ship and follows her sister to Strongrock, an island that is home to pirates. On Strongrock, Dag discovers that the pirates are hiding dangerous secrets; secrets that threaten to ensnare Inger and turn her against her country and her twin.<br />
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When fellow Intelligencer Calder Rahmson arrives to escort Dag back home, the two of them find themselves targeted by the pirates. Fleeing for their lives, Calder and a heartbroken Dag are forced to leave Inger behind. Dag vows to find her sister and save her from the pirates, but when she discovers that the pirates are a threat to the Fair Seas Treaty Alliance, Dag faces a terrible choice between saving her sister and saving the Alliance.</p>