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Deep in Fin Land's cool waters, Greta spends her days competing in chomping competitions, laughing out loud with her shark-maid classmates, and pranking her parents with best friend, Morgan the jellyfish. You might say Greta and Fin Land are a perfect fit. But when Mom and Dad announce a big move to glamorous Mermaid Cove, Greta worries she won't fit in at all. And things get worse when Morgan paints a worrisome picture of the 'snobby' mermaids who live there.

Loaded with dubious intel that Morgan heard from a seal, who heard it from a starfish, who heard it from... well, you get the idea, Greta hatches a plan to transform herself into something she is definitely not -- a mermaid.

Greta sinks to extraordinary depths to hide her true self from her new mermaid friends, but she is finally feeling like she is 'fitting in.' That is, until a momentarily slip-up at the big Sea Spectacle Parade triggers an urgent call for a hero -- a call custom built for a proud shark-maid.
Will the mermaids reject her if she fully drops the act and saves the day? Or, has Greta seriously underestimated her new friends and neighbors?