There are 3 books in the Delirium series. The newest book is Requiem which came out in 2013.

1
Delirium

Book cover of Delirium

'A dystopian Romeo and Juliet story that deserves to be as massive as Twilight' Stylist

They say that the cure for love will make me happy and safe forever. And I've always believed them. Until now.

There was a time when love was the most important thing in the world.…

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2
Pandemonium

Book cover of Pandemonium
'Crackling with tension...whip smart and addictive' Marie Claire Love, the deadliest of all deadly things. It kills you when you have it. And when you don't. The old life is dead. But the old Lena is dead too. I buried her. I left her beyond a fence, behind a wall…

3
Requiem

Book cover of Requiem

'The new Hunger Games... ' Cosmopolitan

He never loved me. It was all a lie.
'The old Lena is dead,' I say, and then push past him. Each step is more difficult that the last; the heaviness fills me and turns my limbs to stone.
You must hurt, or be…