Ava and Sophie are out on the lake with their father when he loses his glasses. He's blind, and he's lost the paddle in the water! But the girls aren't scared: they know Maggie the Muskie lives in the lake. The big fish is famous for helping people who are in trouble.

Together, Ava and Sophie sing the song that summons Maggie the Muskie. But will she answer their call? And if she does, will she be able to find the glasses before the sun goes down? This charming book is all about determination, friendship, and the fantastic creatures that live all around us in the natural world. Join Maggie, Ava, and Sophie on the adventure of a lifetime.