MIDNIGHT (Warriors: The New Prophecy, Book 1)

Darkness, air, water, and sky will come together…
The wild cats of the forest have lived in peace and harmony for many moons — but a doom that will change everything is coming. Strange messages from their warrior ancestors speak of terrifying new prophecies, danger, and a mysterious destiny.
All the signs point to young warrior Brambleclaw as the cat with the fate of the forest in his paws. But why would the son of wicked cat Tigerstar be chosen to be a hero? And who are the other cats mentioned in the prophecy? All Brambleclaw knows for sure is that the strength and courage of the greatest warriors will be needed now, as the quest to save the Clans begins.
…and shake the forest to its roots.