keene no mercy. >> he was coming at you on all fours? >> oh, god, he was a bulldog. >> jimmy was convicted and slapped with a ten year sentence. >> it was a pretty stiff sentence. i knew he didn't expect ten years in that case. >> your father was in the courtroom. >> right. i knew i let him down, probably one of the biggest ways you could let somebody down. >> keene's future was bleak. he faced ten years away from his glamorous life, the fast women, the fancy cars, the big bucks. in 1998 just when all hope seemed lost, his old nemesis, beaumont, came to him with an offer of freedom, attached to that accordion file he slid across the table. in return, keene would have to agree to risk everything and become an undercover informant in one of the roughest prisons in the country, the maximum security lockup in springfield, missouri. it was a psychiatric prison with both hardcore killers and the criminally insane.