Audiobook Vigilante: A Sara Vallén Thriller, written by Cecilia Sahlström. Intrigue, illusions, and insidious motives. Still recovering from testifying against her abuser, Chief Inspector Sara Vallén is called out to investigate a mysterious death in an idyllic allotment on the outskirts of Lund. The victim - a beloved social worker - is found brutally murdered inside one of the potting sheds.