Detective brothers Frank and Joe investigate a stolen robot in the thirteenth book in the interactive Hardy Boys Clue Book series. Frank and Joe are excited to join Chet as he gets a preview of Robo Freeze, Bayport's newest sweet treat phenomenon. But Robo Freeze isn't just any ice cream shop--Sherbot the robot scoops and tops your cone to your exact specifications. But just before his big debut, Sherbot is bot-napped! Who'd want to sabotage Robo Freeze before their grand opening? Can the Hardy Boys track down the culprit and get back the robot, or will they be left with a melty mess?