Berrynose reports to Bramblestar that the water in the lake tastes weird, and he thinks that it might be poisoned. Bramblestar checks it out and says that it is water from the sun-drown-place, and sees that the water has flooded from there. Later that night the water reaches the camp and ThunderClan has to evacuate.
To the Tunnels
When the lake floods and the dens get destroyed, Bramblestar leads ThunderClan into the tunnels and they make their home there temporarily until the water goes down so they can return and repair their home.
The Other Clans
Bramblestar goes to see If the other Clans were okay. RiverClan had moved up to higher ground, ShadowClan was having trouble with kittypets but they were too proud to ask for help, and WindClan was settling fine and had gotten a lot of big white birds flying in from the sun-drown-place.
Finding the Kittypets
Bramblestar, as well as a few other ThunderClan cats go to the Twolegplace, which has flooded. Due to that, all of the Twolegs have left. The ThunderClan cats try to collect carpets because they have no dry moss. On the way they meet kittypets that have been left behind named Frankie, Jessy, and Minty and they come to ThunderClan. In the end Frankie was the only one that stayed in Thunderclan, and his name later becomes Stormpaw.
Blackstar loses his last life due to drowning in the great storm and Rowanstar becomes the new leader of ShadowClan.
Water Levels Going
Jayfeather and Bramblestar measured the water level every day, and every day it would go down a little bit. After a while the water level went down enough for them to return back home.