There are 3 books in the This Alien Earth series. The newest book is The Children of Tomorrow which came out in 2020.

1
The Paths Between Worlds

Book cover of The Paths Between Worlds
Welcome Children of Earth. Do not be afraid.
After a devastating car crash leaves her addicted to pills and her best friend dead, Meredith Gale has finally been pushed to her breaking point. Ending her life seems like the only way out, and that choice has left her dangling by…
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2
A Memory of Mankind

A Memory of Mankind
The answers are out there...With the island of Avalon far behind them, Meredith and her companions continue their search for Candidate One in the hope of finally discovering the secrets behind why they were brought to this strange, future-version of Earth.Wild adventures, mysterious technologies, and new friends will help Meredith…

3
The Children of Tomorrow

By Robert Greenberger , Paul Antony Jones ,

Book cover of The Children of Tomorrow
The Race is on… Meredith Gale has to make contact with the Architect before the Adversary’s agent, the transformed Abernathy, reaches her and ruins the millennia of planning designed to save the Earth. In order to accomplish this, she and her ragtag band of friends have to unify the scattered…