One of the most brilliant scientific researchers of recent years stands accused of committing an elaborate scientific fraud, fooling many eminent experts.
In 2001, a team led by Hendrik Schoen appeared to have invented the smallest organic transistor ever made.
Only a single molecule in length, it was hailed as a huge breakthrough, capable of transforming the world of computers.
But, as BBC Two's Horizon programme shows this week, the "breakthrough" led to his disgrace and began a cascade of events that would result in one of the most intriguing science stories of recent years.
When he published his work, Schoen's tiny transistor was regarded as a discovery that could have blasted open the world of nanotechnology - where cheap, powerful computers could transform the world in which we live.