Birgitta, part 1. A detective queen is poisoned in her home, surrounded by her invited guests. It soon turns out that one of the suspects has a connection to Nora. The investigation runs into unexpected problems and behind the scenes Alexander's problems worsen.

Birgitta, part 2. One of Nora's closest relatives becomes the main suspect in the case and Henrik asks her for help. The tracks turn out to reveal secrets from the past. The solution is within reach, but at the same time Nora is faced with a difficult choice.