"When the waters of disaster meet the forest floor, five unlikely must step up, before the clans are no more."

"This is the chilling prophecy that five medicine cats receive on an oddly cold night in New-leaf when five cats give birth to new litters. Along with these words comes an image: Five shadowy figures standing on a hill in the pelting rain with several cats below them. Eventually, the words are put out of mind.
Now zoom forward a few moons. It's the middle of new-leaf, and several kits have been Apprenticed. Rainpaw of TreeClan, Streampaw of DesertClan, Riverpaw of RapidClan, Ripplepaw of SwampClan, and Wetpaw of SparkClan. These apprentices do not know each other, and carry separate personalities. Strangely, they have one thing in common. They keep seeing these images in dreams. Their territories under water, cats running from a large wave of water, etc. They tell no one, but they also keep hearing the words of the long-forgotten prophecy when they least expect it.
Another image that comes to mind is a large lake that only a few recognize. Then comes the unending rain. Will the apprentices realize their destiny? Will they come together, despite Clan boundaries, to save the Clans'? Only time will tell."