There are 5 books in the Ash and Ruin Trilogy series. The newest book is Blackbird which came out in 2018.

1
World of Ash

Book cover of World of Ash
There are two inherent truths in the world: life as we know it is over, and monsters are real. The Pestas came in the night, spreading their pox, a deadly plague that decimated the population. Kat, one of the unlucky few who survived, is determined to get to her last…
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2
Time of Ruin

Book cover of Time of Ruin
The world has ended, and hope is the most dangerous thing left. Battered and bruised after barely escaping San Francisco with their lives, Kat, Dylan, and Blue press north – desperate to reach the possibility of a new home. But strange, monstrous ravens are tracking the remaining survivors, food is…

3
Age of Blood

Book cover of Age of Blood
Hope is a dangerous thing, but powerful. Hope keeps you going. Hope can keep you alive. But hope can shatter your world. Kat and Dylan have found a home, but the monsters are still out there. The pox and plague still ravage the world. They have hope of finding a…

4
Dandelions

Book cover of Dandelions
At fifteen years old, Gwen’s world has ended. Not because she’s gone through a break-up. Not because her parents are ruining her life with a lame curfew. Not because her grades are struggling. Not in the way a fifteen-year-old’s life usually ends.At fifteen years old, Gwen has burned the dead…

5
Blackbird

Book cover of Blackbird
What if YouTube warned of the end of the world? Would we even take it seriously? Or just assume it was some lame, internet hoax?Maggie has her first college finals to prepare for; she doesn’t have time for pranks and conspiracy theories. But a super flu has broken out on…