A lost manuscript from the pen of obscure Scots-Irish writer Martin Caulder, recently come to light. A pseudonymous work for the Olympia Press in Paris in the 1960s. A mysterious packet of papers from the 1920s. A Strange Case from the 1890s in fin de si cle Paris. William Crowe and Stephen Devlin, Irish exiles and students of the Occult, have made a dangerous wager: who shall be the first to woo young Thomas MacGilpatrick,...