London spiraled into mourning -- crowds sported black armbands in grief -- and railed against Conan Doyle as his assassin. Then in 1901, just as abruptly as Conan Doyle had "murdered" Holmes in "The Final Problem," he resurrected him. Though the writer kept detailed diaries of his days and work, Conan Doyle never explained this sudden change of heart. After his death, one of his journals from the interim period was discovered to be missing, and in the decades since, has never been found. Or has it? When literary researcher Harold White is inducted into the preeminent Sherlock Holmes enthusiast society, The Baker Street Irregulars, he never imagines he's about to be thrust onto the hunt for the holy grail of Holmes-ophiles: the missing diary. But when the world's leading Doylean scholar is found murdered in his hotel room, it is Harold - using wisdom and methods gleaned from countless detective stories - who takes up the search, both for the diary and for the killer.

    An anonymous young woman murdered in a run-down hotel, all identifying characteristics dissolved by acid. A father publicly beheaded in the blistering heat of a Saudi Arabian public square. A notorious Syrian biotech expert found eyeless in a Damascus junkyard. Smoldering human remains on a remote mountainside in Afghanistan. A flawless plot to commit an appalling crime against humanity. One path links them all, and only one man can make the journey. Pilgrim.'