La Quête de l'Oncle Henry [Uncle Henry's Quest]

Your Uncle Henry has traveled the world with his motorhome. He was a historian in the past, he often spoke of a mythical treasure, but everyone saw it as a delirium due to old age and his passion for history, travel and cultures around the world. You are his family and he told you he was leaving for Scotland and would be back on a specific date. This friendly character has disappeared and sent you a mysterious letter.