Eureka"s tears have flooded the earth, and now Atlantis is rising. Eureka is the only one who can stop Atlantis"s evil king, Atlas, but first she must learn how to fight. Her friend Brooks now lost to her forever, Eureka travels across the ocean with Cat, her family, and the gorgeous and mysterious Ander. Trying to make sense of the dark world her sorrow has created, Eureka discovers a soul-crushing secret. If she"s strong enough, Eureka can use it to defeat Atlas - unless her broken heart is just what he needs to fuel his rising kingdom. In Waterfall, Eureka has the chance to save the world. But she"ll have to give up everything - even love.