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In a world where vampires rule and teenaged humans are quarantined as a food source, there's only one choice - resist or die.

But fighting Ticks comes at a terrible cost to twin sisters Mel and Lily and their best friend Carter. With Lily exposed to the Tick virus and lying in a coma, it's up to Mel and Carter to search for the cure - and quickly. For with every passing heartbeat, Mel is becoming more and more purely vampire.

Now their only choice is to split up in a race to save Lily - and to save humanity.