Volume Four of the Plague Z series! 
Siblings Alexi and Irina are in big trouble. They have been running from Plague Z, a horrific new disease that is terrorizing every corner of the globe. The infected can think, they can communicate, and they are hungry for more. It seems there is no way to escape. 
Putting their faith in a scientist with a lot of secrets, and even more promises, seemed like the best choice at the time. Now, they are seriously regretting it. Trapped, with the infected on every side, the siblings can see no way out of the mess this time… 
Will they be able to make the flight and escape? 
All they can hope for is that freedom waits for them, one way or another...