Illustrator(s)
Satu Kontinen
Publication date
5/2026
Publisher
Tammi
Format info
170 pp, age 7+

The Island Adventures 4: The Secret of the Troll Valley

Satujen saaret 4. Trollilaakso

The much-loved adventure series continues! The Islands Adventures series is set alternately in Finland and Iceland. Icelandic, and film and theatre rights sold.

Satu travels to Iceland to spend an amazing summer holiday with her cousin Saga. With adventure on their mind, the girls set off on a camping trip to Troll Valley. There, Saga and Satu meet Emil and Maria, who each have their own farm in the valley. Although they are brother and sister as well as neighbours, they refuse to speak to one another. The girls are intrigued to find out what lies behind their bitter disagreement?

As Saga and Satu try to uncover the reason for the feud, they soon realise that Troll Valley is also home to many other fascinating inhabitants. When the girls begin investigating the valley’s strange happenings, their holiday takes an exciting and unexpected turn.

Material

Finnish PDF
English sample translation (1)

Rights sold

TV/Film: Take Two Studios
Icelandic: Forlagið

Prizes & Nominations

nominee, Lasten LukuVarkaus Award (Book 1)
nominee, Runeberg Junior Prize 2026 (Book 2)

Reviews

‘The concept of the THE ISLAND ADVENTURES series is in many ways ingenious. […] It could have easily been just a ‘cute’ fairy-tale, but fortunately the story also includes mystical elements of a detective adventure. Kontinen’s illustrations are a bold departure from traditional children’s book illustrations. […]’ — Päivi Heikkilä-Halttunen, Lastenkirjahylly blog

Series