11 A.M.
She was right . It was directed by Froggy , but Priscilla paled suddenly as she took it , realising that it contained an answer to her own urgent note . Alone in her own room she opened it . The message was even briefer than hers had been : `` Sweetheart , -- At 11 A.M. , on Thursday , under the dome of St. Paul 's Cathedral . -- I am thine , J. C. '' Priscilla stood for long seconds with the note in her hand . It had reached her too late . The appointment had been for the day before .