Internal Sacrifice

The only female to side the vampire overtake, wants a mate so that the human race will not completely die off.

Vampires cannot mate with humans, so the leader of the vampires search for a mate. Only 3 have gotten past the walls; the first was so scared he could barley speak, the second one tried to kill her, and #3 had just arrived.

If number three fails she has promised to allow the coven to change her into a vampire willingly.