The Secret of the Swiss Chalet

I An Intriguing Case II A Plane Prisoner III The Suspicious Guest IV The Missing Guide V A Search Gets Under Way VI A Mountain Rescue VII A Mysterious Struggle VIII The Secret Shelf IX A Worrisome Wait X Thief in Disguise XI Obnoxious Tourists XII Avalanche Dogs XIII A Clue Pays Off XIV A Dangerous Climb XV Scoundrel on Skis XVI A Puzzling Clue XVII The Silver Peacock XVIII Deceived Detectives XIX The Avalanche XX A Treasure Revealed