On a chilly September morning in 1990, a woman's body was found along the bank of the Vitava River in Czechoslovakia, near Prague. She was lying on her back, nude, with a pair of gray stockings knotted around her neck. Left in a sexually suggestive position with her legs open, she was covered with leaves, grass and twigs. Those who found her ran to alert the authorities. On her finger was a gold ring.

It appeared that she had been killed recently, perhaps the night before. There were bruises all over her, signaling quite a struggle, but oddly enough, no sign that she had been raped. Her fingerprints were not on file.

As the investigating officer, where do you go from here? Come along and test your investigative skills.