Can mermaids appear in the lake on the shores of which the construction of a new resort has begun? Numerous eyewitnesses claim that this happened! There are mermaids, we even managed to film them. Journalists from well-known TV channels and scandalous publications are searching for sensational materials. There is a real hunt for mermaids. And then one day the body of a popular metropolitan TV presenter is found on the shore. And next to it is a dead girl, naked, with long hair, covered in fish scales. It took a while for Marina and Vadim, a couple of home-grown detectives drawn into a criminal whirlpool, to figure out what was what. And answer the two main questions of any investigation: who and for what purpose?