There are 2 books in the In the After series. The newest book is In the End which came out in 2014.

1
In the After

Book cover of In the After
In debut author Demitria Lunetta's heart-pounding thriller, one girl must fight for her survival in a world overrun by violent, deadly creatures. Perfect for fans of New York Times bestsellers like The 5th Wave and Across the Universe. Amy Harris's life changed forever when They took over. Her parents-vanished. The…
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2
In the End

In the End
The thrilling conclusion to the survival story In the After, set in a near future where Earth has been overrun by vicious, predatory creatures. It's been three months since Amy escaped New Hope, and she's been surviving on her own, like she did in the After. Then one day, her…