(Michael Curtis) Some mysteries are solved, but many remain unsolved. A reminder of the latter appears in a new Swedish TV documentary about the assassination of the Social-Democratic Swedish prime minister Olaf Palme on the evening of February 28, 1986, on the busiest street in central Stockholm, on which several people were walking. Who killed Palme, and why does it remain a mystery? A police investigation examined thousands of people, but no murder weapon was found, and no forensic evidence was uncovered, and there was no clear motive for the murder. Serious mistakes were made.