In the 1950s, the tower block was born. But by the 1970s, these cities in the sky became slums. In 2017, missed warnings, vague regulations and corners cut in favour of financial return resulted in the deadliest tower block fire in British history.

Follow the team from UFO Magazine as they open their files and investigate UFO cases around the world.

Investigate the ways in which ancient intelligence services passed messages over thousands of miles.