D.F. Stanley 
Shaun and the Lost Treasure of Atlantis [EPUB ebook] 

Embark on an unforgettable journey with Shaun, an adventurous teenager who stumbles upon an ancient map in his attic, leading to the mythical city of Atlantis. With his loyal and quirky dolphin friend, Splash, Shaun faces whirlpools, sunken ships, and the cunning treasure hunter, Ollie, while unraveling mysteries of bravery, friendship, and self-discovery. Dive into the dazzling underwater world of glowing caverns, wise sea creatures, and hidden dangers in this heart-pounding adventure that blends teamwork, cleverness, and the spirit of exploration. Will Shaun uncover the secrets of Atlantis and fulfill his destiny?