Artemis Blythe is on the run with only a convicted serial killer as an ally. In order to rescue the man she loves, chessmaster and FBI agent Artemis has to perform a task for the man she hates. The Ghost-killer's demand is simple: find Helen. Artemis' sister has been missing for nearly twenty years, long thought dead. And now, in order to appease her father and his accomplice, Artemis must discover...