Available Formats
Sandy Fin: Mystery of the Phantom Diver
By (Author) Martin Stewart
Bloomsbury Publishing PLC
Zephyr
28th April 2026
29th January 2026
United Kingdom
Children
Fiction
Paperback
224
Width 129mm, Height 198mm
Meet ocean explorer Sandy Fin, silver-scaled diver of the deep, puzzler of puzzles and daring hero of a hilarious middle grade series by Martin Stewart, illustrated in black and white.
Sandy Fin and his best friend Lily are enjoying life by the sea, after saving Portwhistle and its marine life from Albo Starts aquapark.
Suddenly, odd things start to occur: an escaped convict is on the loose, curious mounds of sand appear on the beach. Strangest of all are reported sightings of the Phantom Diver a figure of Portwhistle legend, long believed to be a figment of the most inventive imagination!
Suspicious, Sandy and Lily dive, snoop and climb their way through the mystery towards the Phantom Divers true identity.
Martin Stewart made his first book using Post-It notes aged eight. His work has been shortlisted for major awards and translated into multiple languages. A native of Glasgow and a secondary school English teacher, he now lives on the west coast with his wife, two children, and a very big dog.
Instagram: @martin_j_stewart
Santy Gutirrez was born in Spain. He won acclaim as the Best Spanish Young Editorial Cartoonist and Best Galician Caricaturist. He founded the BAOBAB Studio Artists Collective and has been chairman of the AGPI (Galician Professional Illustrators Association) for 6 years.
Instagram: @santygutierrez_art