People have asked me, “Why has it taken you so long to investigate Suzy's case?”.

1986 was remarkable for many reasons. The Space Shuttle Challenger exploded seventy-three seconds after launch, putting space exploration in reverse. The Chernobyl nuclear reactor disaster in Ukraine threatened to kill half the continent, at least according to some commentators. There was a royal wedding, with Prince Andrew marrying Sarah Ferguson. And the M25 London orbital motorway was officially opened.

Madonna to...