Taken from the publisher's website Doctor Sin is a criminal mastermind with a century of experience. He rarely faces heroes directly, instead he's the man at the top of the pyramid (if his involvement is ever discovered at all). A threat on his own, Sin is backed up by a criminal empire that stretches across the globe and runs through its darkest places. Doctor Sin is a threat to experienced heroes like the Freedom League, but how will your heroes handle him when he shows an interest in Emerald City? User information Doctor Sin is a free PDF download.