Short answers, pulled from the story.
Claude François de Malet was a French brigadier general born in 1754 who became disenchanted with Napoleon Bonaparte after opposing his rise to First Consul. He planned the coup while imprisoned at a sanatorium because he opposed Napoleon's coronation as Emperor of the French.
The Malet coup began at 4a.m. on the 23rd of October 1812 when Malet escaped from captivity. The conspirators were executed by firing squad starting on the 29th of October, ending the plot within six days.
Malet forged documents claiming that Napoleon had died while commanding troops in Russia during the invasion of 1812. These forgeries convinced Colonel Gabriel Soulier and others to arrest officials and release imprisoned generals Victor Lahorie and Maximilian-Joseph Guidal.
Colonel Doucet discovered the fraud when he recognized Malet as a sanatorium inmate and noted that letters referenced Napoleon dying on the 7th of October despite receiving correspondence after that date. Doucet overpowered Malet and ordered the National Guard's 10th Cohort back to its barracks.
Claude François de Malet, Lazare Carnot, and Maximilian-Joseph Guidal were tried before a council of war and executed by firing squad on the 29th of October 1812. Other conspirators including Colonel Soulier were shot on the 31st of October while the commander of the Paris Guard was spared execution.