+3 Mystic River Mermaid CASPM05AA $14.99 In stock Quantity: 1 Add to Bag Product Details Brand: Peg Casey "Mystic River Mermaid" is the story of a girl and her grandmother, who have an encounter with a mermaid. 62 pages. Author and illustrator Peg Casey’s book, "Mystic River Mermaid," is a finalist in the Independent Publishers of New England Book Awards. Save this product for later Favorite Share