When police in the UK received a panicked phone call from a teenage boy in the summer of 2003, it seemed fairly routine. His friend had been stabbed and was in need of medical attention. Authorities were told it was a random, unprovoked attack, but that could not have been farther from the truth. In fact, the attack had been meticulously planned for months. The perpetrator was so unexpected and the whole situation was so strange, authorities almost dismissed the case entirely. England had never seen a crime like this before.

Learn more about your ad choices. Visit podcastchoices.com/adchoices