The Heretic's Creed (A Tudor mystery featuring Ursula Blanchard)

Sir William Cecil has a mission for Ursula Blanchard. She must visit group of recusant women led by Abbess Philippa Gould. They possess an ancient book that the Queen's advisor is eager to get hold of. But two of Sir William's previous emissaries vanished without trace in the search. What happened to them and will Ursula suffer the same fate?