Diamond Invisibility

In the service room of the Diamond Fund, the body of a well-dressed woman with rich jewelry has been discovered. The victim's lips are severely burned, and despite the winter slush, there are no traces of street dirt on her shoes… Moreover, police colonels Gurov and Kryachko noted a strong chemical smell at the crime scene. Upon checking, it was revealed that the stranger managed to avoid all surveillance cameras. Who is she, and how did she end up in a storage area closed to outsiders? In the end, Gurov manages to identify the victim. A loud case from the early 90s, related to the theft of jewels, resurfaced in the colonel's memory…