Once upon a time, in the deep blue sea, a shark named Finn swam gracefully.

Unlike his friends, Finn loved adventures, not frights, and would roar off to explore many sights.

He'd glide through reefs and greet the fish, sharing smiles and flips which were quite swish.

One day, near a ship sunk long ago, Finn found a chest with a pearl glow.

With a wiggle and a swish of his fin, the chest creaked open, and Finn peered in.

Inside there shone a necklace so bright, made of pearls pure and white.

But suddenly, there came a small cry, and a hermit crab named Sammy caught Finn's eye.

Sammy was small with wise old eyes; he knew the necklace's value and began to apprise.

"This necklace is precious, it's true. It belongs to Marina, kind and blue."

Finn, with a heart as vast as the sea, decided to return the treasure, for that was the key.

Together with Sammy, through waters they sped, to find Marina with her hair, bright as sunset red.

Upon finding Marina, Finn's heart did sing, and he returned the necklace, a truly noble thing.

Marina smiled, her gratitude known, and Finn felt happy that kindness was shown.