Private detective Tatiana Ivanova dreamed of renovating her apartment, fixing her car and finally relaxing in nature. But in the cottage "Oak and linden" instead of resting she was waiting for an unpleasant surprise. Tanya found a severed female hand with a conspicuous German ring on her finger. And soon to detective Ivanova appealed to a well-known businesswoman Eckelman. She has a missing daughter Olga, and all traces of the missing girl lead to the ill-fated cottage ...