There are 4 books in the Tomorrow Girls series. The newest book is Set Me Free which came out in 2011.

In a terrifying future world, four girls must depend on each other if they want to survive.Louisa is nervous about being sent away to a boarding school -- but she’s excited, too. And she has her best friend, Maddie, to keep her company. The girls have to pretend to be…
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2
Run for Cover

Book cover of Run for Cover
In a terrifying future world, four girls must depend on each other if they want to survive.Now that best friends Louisa, Rosie, Evelyn, and Maddie know the truth -- or at least the danger they're in -- the girls have run away from their "safe" country retreat. But life is…

3
With the Enemy

Book cover of With the Enemy
In a terrifying new world, four girls must depend on each other if they want to survive.Evelyn has always suspected that things are more sinister and more complicated than they seem. Now that Maddie has been kidnapped, Rosie, Louisa, and the boys are paying more attention to Evelyn's theories. As…

4
Set Me Free

Book cover of Set Me Free
In a terrifying future world, four girls must depend on each other if they want to survive.

Maddie is ready for action. Louisa, Evelyn, and Rosie helped rescue her from the Alliance's grasp, and she's learned an enormous, game-changing secret: her mother is the leader of the Resistance!

But reuniting…