One novel on his list:
Red Dragon by Thomas HarrisRead about another famous tattoo on Mullan's list.
Though the serial killer – and penpal of Hannibal Lecter – is hard to track down, he is not exactly concealed. Possessed by a spirit that he calls "the Dragon", he has a great red dragon (based on a design by William Blake) tattooed on his back. However, Reba, the women who befriends him, is blind, so no giveaway.
Red Dragon also appears among the (U.K.) Telegraph 110 best books; Andre Gross says "it should be taught as [a text] in Thriller 101."