Aristide Valentin holds a dinner party in his secret garden, which only has one main entrance. Many people are invited. Julius K. Brayne, one of Valentin’s rivals, is of the party as well. Everything goes as planned until one group of guests finds a beheaded corpse and the dinner turns into an investigation. Many questions begin to arise: How could someone be killed in a closed back garden without anyone noticing? Who is the victim? Who is the murderer? Where is the head? Find out the answers in "The Secret Garden".