One summer, young Ronnie’s father puts a wading pool in the backyard. Ronnie loves playing in the water and even tells his mom he’s going to be a deep-sea diver someday. Following a heavy rainstorm, the wading pool takes up most of Ronnie’s backyard—which is when something amazing happens.
A colorful fish swims by. Ronnie thinks the fish might just continue on its way; instead, Mr. Fish invites Ronnie on an adventure to visit an underwater city. These two new friends swim along together and see all sorts of interesting creatures, including a parrotfish, butterfly fish, triggerfish, and more.
Ronnie’s day culminates with a parade of extraordinary colors. Fish swim, dance, and even play music while Ronnie learns what makes each of them special and unique. Eventually, Ronnie has to return home … but his day of surprises isn’t over yet! A celebration waits, and Ronnie will soon have even more fish friends.