There is no proof for the claim that this villain transmigrates between bodies. The numerous crimson-handed murderers who have cheerfully pleaded guilty to crimes performed with his particular modus operandi are most likely lunatics, or, according to more hysterical accounts, members of the same esoteric society. These madmen have been known to commission penny-dreadfuls detailing the crimes of "Jack". Surely if anything this discredits them further.