A vampires mission

(Disclaimer;) This book was written by John R. Green and is not to be mistaken as the John Green who wrote, "The Fault in Our Stars." This book and the ones listed below contain mature themes and strong adult sexual content. It is not intended for readers under the age of 18.) Christopher was on a mission. His job was to keep the king of the vampire's last human descendants Tom and Susan from harm. Count Fargo wanted them dead. With Susan and Tom dead, Count Fargo would have the power to kill King Michael and start a war with the humans. When Christopher first met Tom, they became more than friends right away. No one knew where Susan was except Tom. Count Fargo found out that Tom was one of two of King Michaels last human descendants. He sent a vampire named Marco find out where Susan was and kill them both. Tom didn't tell where his sister was and Marco drained him of his blood. Tom now a vampire must help Christopher on his mission to keep Susan safe.