Black Heart is by Justin Somper. The fourth book in the Vampirates series. There is a new group of vampirates roaming the seas. After an attack on the Pirate Academy, the pirates ask Chen Li to hunt them down and kill them. She chooses Connor for her crew. He agrees, but is worried about his twin sister Grace who is on a Vampirate ship. As Connor and his friends learn how to kill vampires, Grace is discovering the answers to her questions about the twin's past. Secrets that will change both their lives forever. Fans of the series will not be able to wait for the next installment.
Ratings: 8th grade - 8 out of 10 - V (violence).