During the 1950s, Helsinki was the focal point of the Cold War, as global powers and their intelligence agencies coalesced in the small neutral country that stood between the East and the West. Shadow Lines is an international spy thriller that follows a secret intelligence team whose mission is to defend the independence of Finland no matter the cost.

Jussi Vares falls in love with a beautiful brunette – only to lose her in a horrible way. After dating Sole a few weeks, her body is found in a bird-watching tower. The investigations come to a standstill, until Vares promises to solve a mystery of messy denunciation letters. Before the letters reveal their secret, a lot of things happen. A gun-for-hire, Stahanov, gets an assignment. Sole’s brother finds his wife in the arms of a wrong man and goes on a rampage, accompanied by a black cat. In the end the clues lead to a familiar person and more death in unavoidable