The Secrets Below

This atmospheric middle-grade thriller set in the Swedish archipelago manages to blend everyday loneliness with genuine unease in a way that feels both grounded and unsettling. Twelve-year-old Tuva is a quiet, isolated kid who loves her island home of Harö, even when school feels like a struggle. When a classmate vanishes and other people begin disappearing from the surrounding islands, Tuva and Rasmus, the new boy at school, find themselves witnesses to something strange and possibly supernatural happening in the woods near the water.

What works really well here is the mood. The cold, rocky islands and the dark forests create a palpable sense of isolation, and Sten captures that specific kind of childhood fear where you're not sure if what you saw was real or if adults will even believe you. The pacing moves quickly without feeling rushed, and there's a nice balance between the mystery elements and Tuva's more personal struggles with fitting in and finding her voice. The friendship that develops between Tuva and Rasmus feels authentic, built on shared fear and curiosity rather than forced camaraderie.

The fantasy elements lean more toward eerie folklore than high magic, which suits the setting perfectly. Readers looking for a Narnia-style adventure might find this a bit darker and more grounded than expected, but if your young reader enjoys spooky stories with heart, this hits a sweet spot. It's genuinely tense in places without being traumatizing, and it respects its audience's intelligence. The resolution ties things together satisfyingly, though some readers might wish for a bit more explanation about the supernatural forces at play.

This is ideal for kids around ages ten to thirteen who are ready for something with real stakes and a touch of darkness, especially if they've outgrown purely cozy mysteries but aren't quite ready for full-blown horror. It's a quick, absorbing read that lingers in the imagination afterward.