The Linköping police, in which detective Malin Fors serves, threw all their strength into solving a resonant crime that excited the whole of Sweden. A powerful explosion occurred in the central square of the city, as a result of which two little girl sisters were killed. The version of the terrorist attack was not confirmed, nor were the suspicions about a maniac. Then a seemingly absurd thought occurred to the detective: what if the explosion was aimed specifically at the sisters? What if they really bothered someone?..