A vampires mission

Christopher was on a mission to keep the king of the vampire's last human descendants Tom and Susan from harm. Count Fargo wanted them dead so he would have the power to kill King Michael and start a war with the humans. When Christopher met Tom, they became more than friends right away. No one knew where Susan was except Tom. Count Fargo found out about Tom and sent a vampire named Marco to find out where Susan was and kill them. 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.