Ron Charles – The Washington Post: What follows is a wild story of double-crossings, forgeries, kidnappings and murders that's engrossing even when it's ridiculous. (At one point, the code secret is tattooed on a beautiful woman's thigh — so handy.) We've got Russian mobsters, Jewish gangsters, Nazi thieves, international models and currency traders, oh my. And all of this madcap adventure in the present is mirrored in a story we gradually decipher from that 17th-century letter, describing a nefarious plot by radical Puritans to entrap "the secret papist Shaxpure." While twisting the plot into great knots of complexity, Gruber mixes in fascinating details about rare manuscripts, intellectual property, and ancient and modern cryptography.