For Connor, these are testing times aboard notorious pirate ship, The Diablo - not least when Captain Wrathe's obnoxious nephew Moonshine joins the crew. And, as things reach breaking point, Connor finds himself crossing a line from which there is no return. Meanwhile Grace and Lorcan journey to Sanctuary, a mountain retreat presided over by vampirate guru, Mosh Zu Kamal. If anyone can heal Lorcan's blindness, it's Mosh Zu, but he's more interested in Grace. Combatting danger on all sides, Grace realises her fate is inextricably bound up with the vampirates.