I Am Last Night Book 3 Night Series

Is there some sinister plot to rid the world of vampires and especially Jovani Nightingale? Does Justin a member of the Samsa pack have a hand in this deed, or is Sasha who wants to possess Jovani willing to kill him so Hannah can never have him?
This makes it all the more vital that Jovani mate with Hannah to bring into the world his offspring who can walk during the daylight before he meets his last night on this earth.
“There’s a need for vampires,” Jovani explains to Hannah, “If we can come into the light, we can purge the world of the humans and vampires who bring darkness to all mankind by preying on trusting and innocent men, women, and children.”
Will Hannah believe Jovani and sleep with him or will she sleep with Justin Samsa of the Samsa werewolves? Does Jovani believe he’s the savior of mankind when he’s not human anymore but cold and immortal? And will he stalk Justin because he’s fearful that Justin will mate with his beloved Hannah?