Mary Russell, assistant and protégée of the great Sherlock Holmes, finds herself and her partner once more mired in mystery. When Mary is given a scrap of papyrus by an old archaeologist friend, she has no inkling of what it contains. Written in Greek, it could be a letter from a previously unknown apostle - who just happens to be female. However, the situation moves from being curiously exciting to chillingly perilous as the archaeologist is murdered and Mary and Sherlock's home is ransacked. Given the possible implications of the fragment, the list of suspects and motives seems endless.