Mother Death Comes Forever

A stroller with a dead child is found in a provincial town. And soon afterward, a businesswoman is killed by the murderer in her own home. In her hands, investigators find a doll, suggesting a link between these crimes. The detectives must figure out what the criminal wanted to say by this.
However, investigating the case, Captain Zatopets comes to the conclusion that the killer is leading the detectives by the nose. And it is helped by a press-center employee of the regional police. But in the end, she also dies—with a little doll in her arms. So who devised and directed this scenario?