On March 21st, 1945, the British Royal Air Force set out on a mission to bomb Gestapo's headquarters in Copenhagen. The raid had fatal consequences as some of the bombers accidentally targeted a school and more than 120 people were killed, 86 of whom were children.
When a homeless Romani boy is arrested at the Danish border for possession of a missing public servant's passport, police inspector Carl Mørck and Department Q are tasked with finding the connection.
Markus returns home to care for his daughter when his wife dies in a tragic train accident. However, when a survivor of the wreck surfaces and claims foul play, Markus suspects his wife was murdered and embarks on a mission to find those responsible.
The Danish ambassador to Washington declares himself to be the sole representative of a free Denmark during the Nazi occupation of the country.