tom swift among the diamond makers

 in Mildred wort Benson they Mr. Benson won't tell penny who is blackmailing him. But he did say that's he was a convict from prison and he admitted he was being blackmailed but no one knows hew but himself. But he did say that peter fenestra was a bad piece of work and he should be left to himself because everybody doesn't really like him. He is the one with the mysterious storm cave then old horney comes with a letter he found while he was cleaning up. But that letter is in the next chapter so I can't tell you what was on it I can't tell you either because I forgot.