In "The Adventurous Four" by Enid Blyton, the holiday plans of ginger-haired Tom and his twin sisters, Jill and Mary, take an unexpected turn as they embark on an exciting boat trip with their best friend Andy, a fisher-boy from a Scottish coastal village. The initial plan to camp on a nearby island turns into a gripping tale when a shipwreck leaves them stranded. Suddenly thrust into a thrilling and mysterious adventure, the quartet must navigate the challenges of the unknown. Blyton's vivid storytelling weaves together elements of suspense, camaraderie, and discovery as the children confront the unexpected twists of their maritime escapade, making "The Adventurous Four" an enthralling read for young and curious minds.