Winter, having secured nothing but vain promises from the constable, returned to England about the end of April, bringing with him Guy Fawkes, a man devoted to the Roman Catholic cause and recommended for undertaking perilous adventures.
Subsequently the three and Thomas Percy, who joined the conspiracy in May, met in a house behind St Clement's and, having taken an oath of secrecy together, heard Mass and received the Sacrament in an adjoining apartment from a priest stated by Fawkes to have been Father Gerard.
Fawkes was despatched to Flanders, where he imparted the plot to Hugh Owen, a zealous Romanist intriguer.
Guy Fawkes himself was to take ship immediately for Flanders, spread the news on the continent and get supporters.
Catesby, however, after some hesitation, finding from Fawkes that nothing had been touched in the cellar, and prevailed upon by Percy, determined to stand firm, hoping that the government had put no credence in Monteagle's letter, and Fawkes returned to the cellar to keep guard as before.