There are 2 books in the Flesh series. The newest book is Skin which came out in 2017.

1
Flesh

Book cover of Flesh
Ali has been hiding in an attic since civilization collapsed eight weeks ago. When the plague hit, her neighbors turned into mindless, hungry, homicidal maniacs.Daniel has been a loner his entire life. Then the world empties and he realizes that being alone isn’t all it’s cracked up to be.Finn is…
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2
Skin

Book cover of Skin
Six months since the zombie plague struck, former librarian Roslyn Stewart has been holed up in a school with eight other survivors. But now the shelves in the school canteen are bare. The stranger at the gate has supplies that will ensure the group’s ongoing survival, but at a cost.…