On her very first day at her new post in the quiet lakeside town of Bregenz, Detective Mara Eisler stumbles upon a chilling scene – the body of a young woman lying at the foot of the mysterious Wishing Tree. Oberländer and Komlatschek are initially sceptical of their new partner, but just as they begin to find common ground, a second murder shakes up the investigation. The newly formed team must move quickly before the killer strikes again.