Echopaw was swept away in the river and bumped her head a little too hard. Now that she has amnesia, Echopaw has to learn everything over again. But when she decides to live in RiverClan, Echopaw wonders if she made the right decision. And when Mudfur's prophecy shakes every cat to its core, Echopaw and her friends have to find a way to fulfill it, before RiverClan is destroyed.