We may know Monsieur Parizot as the emblematic customer of the Camping Paradis campsite, but it is unclear how the mascot of Tom Delorme and his team spends his time throughout the rest of the year. In his hometown of Colmar, this young retiree enjoys cycling intensively and indulges a passion for crime literature and detective films. But when his fellow cyclist dies in a road accident, Christian Parizot is convinced that his death was no accident! With unofficial assistance from a young policewoman, Parizot sets out to unmask the murderer in a castle that is home to the members of an Alsatian noble family. Amid this gallery of colorful characters, everyone is frantically scrambling to keep their secrets hidden…