International best-selling author Justin Somper's Vampirates series is renowned for its swashbuckling adventure and imaginative plotting. The fourth book in the series, Black Heart picks up with twins Connor and Grace Tempest facing an uncertain future. When a famous pirate captain is killed by a vicious band of vampirates, the Pirate Federation commissions a ship of its own to hunt them down. With Connor on the offending ship and Grace on the other, will both twins make it out alive to continue searching for their mother?