from previous

....where are the diamonds  you fraud, asked  Roger in a low but threatening voice,  , he had come to see Arthur in prison,  Roger suspected  in fact he was very certain  Arthur  stole the diamonds from the  pot with the help of accomplice in mate, 

What rubbish you talk you useless man,  Arthur explained he had been in police custody all that time,  how could he had  stolen  anything  at all  when he was under strict surveillance,  perhaps  Roger himself   stole the diamonds  when  Arthur was in prison, but Roger was  a free man who knew where the diamonds were hidden,  it was more probable 

Roger accused him for using his  partners who were at large,  whom he easily could have messaged 

Arthur quickly cut him short,  wasn't Roger trying to act over smart,  police was investigating  and  both of them were  long time friends after all,  only the two of them knew the exact  hiding place  of the packet,  resha s house was also searched thoroughly and nothing from there was found  so only Roger  alone could be doubted 

Roger argued he was actually planning  to get Arthur out of prison but that wasn't worth it,  he better  rot in he'll there for his   crimes