A strange request -- A three-cornered puzzle -- A surly student -- Unwanted detectives -- An odd bookmark -- Framed! -- A thwarted intruder -- Snowbound -- Cat-and-mouse sleuthing -- A puzzling ad -- Dangerous waters -- A dangerous fire -- A minor explosion -- The wild chase -- A frightened bully -- An unexpected twist -- A startling story -- Cannonballs of ice -- Victory snatched away -- The final roundup.
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