Green

Green is the fourth novel (or Book Zero) of Ted Dekker's The Circle Series.

Thomas Hunter suffers a head injury and wakes up in an alternate reality every time he goes to sleep. He realizes that a deadly virus, the Raison Strain, is about to be released in "our world", and that the forest is also in danger. The virus is released, causing massive casualties, and the tranquil forest in the "other world" is ravaged by evil.

A website was created leading up to it's release. With provides a lot of information on the series as a whole.

This book features these tropes:

 * The Plague/The Virus