In the middle of the summer holidays, the body of a drowned man with ligature marks on his wrists is recovered from Tammerkoski river. The investigation by Koskinen's team is further strained by the hit-and-run case of a dubious music manager and the mysterious Carl Friedrich. When a new body is found in Lake Näsijärvi, the connection between the victims is made clear.
Erika Susanna Vikman (b. 20 February 1993) is a Finnish singer and songwriter. She rose to fame by competing in Tangomarkkinat in 2015 and 2016, winning the latter year and was crowned the Tango Queen. In 2020, she competed in Uuden Musiikin Kilpailu (Contest for New Music) with her hit song "Cicciolina" finishing second.