Your God. Your Country. Your Kin. Who Do You Betray? London, 1563. Catholic plots against the young Queen Elizabeth spring up all over the country. William Harley - known to everyone as Clarenceux - receives a book from his friend and fellow Catholic, Henry Machyn, who is in fear of his life. Then Clarenceux is visited by Francis Walsingham and his ruthless enforcers, who will stop at nothing to gain possession of the book. What secret can the book hold?