Missing in Bielefeld. This case poses a puzzle for the Bielefeld police: Did the attractive investment advisor Heberlein really just disappear to escape his creditors? Although his body was never found, the statement from his flamboyant lover, the femme fatale Lara Kaspari, suggests a crime is more likely. Commissioner Domeyer and his colleague Tschöke from Bielefeld's KK11 soon realize that there is no shortage of individuals with a motive for murder. What did Heberlein mean by the "big fish on the line" he mentioned shortly before his disappearance? Is it about money, or is there something else at play? When a police colleague also vanishes without a trace, the officers are struck by a chilling suspicion. A race against time begins...