The Sealed Case

Tuomas Niskakangas

Original title: Suljettu kansio

Author: Tuomas Niskakangas

Published: 2026

Publisher: WSOY

Genre: Crime & Suspense

Part of a series: Department K

Reading material:

Finnish Edition

English sample + full English draft translation

English synopsis

The start of a gripping new thriller series! The Department K series blends a web of power games and criminal investigations with finely crafted psychological portraits.

When journalist Joel Saarni’s affair with his editor-in-chief makes the tabloid front page, he’s forced to leave his job. But the unfinished story won’t let him go. Someone has sent him a folder containing highly incriminating material: a Finnish network equipment company appears to have made illegal deals in Russia. But why?

Corporate lawyer Petra Thorry has her own reasons for getting involved. She’s obsessed with solving the mystery of a child who vanished in the 1990s.

As the investigation deepens, Petra and Joel are drawn into a tightening web of lies and espionage—where the deadly strings are pulled by Department K.

The Sealed Case launches a new top-tier Finnish thriller series. Department K is an addictive story about unchecked power—and the people who can no longer look away.

Download reading materials

Rights sold:
FINLAND: WSOY (orig.)

About author

Tuomas Niskakangas

Tuomas Niskakangas is a crime author and a politics and economics journalist for Helsingin Sanomat, the biggest newspaper in Finland. He has a Master in Economics. Formerly Niskakangas has worked in Washington, D.C. as the USA correspondent for Helsingin Sanomat.

Photo credit: Marek Sabogal

Bibliography


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The Sealed Case


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