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?