vampire clans as a distinct race that depend on symbiotic relationship with a group of humans to survive 
 interesting dynamic between vampire and symbionts - depend on each other, humans get increased lifespan and health, but are addicted to compounds in saliva and become suggestible ultimately to the point where they can be enslaved or coerced to act against their free will. 
 comes across much more as a young adult novel for me, characters fairly one dimensional and child-like across the board. against that are some disturbing themes.