Robert and Thomas Wintour the continent and again failed to elicit Spanish support, but instead met Guy Fawkes, with whom he returned to England. Robert, a devout Catholic who inherited Huddington Court near Worcester, joined the conspiracy the following year. The plot began to unravel following the delivery of an anonymous letter to William Parker, 4th Baron Monteagle, warning him to stay away from Parliament. Thomas and Catesby confronted Monteagle's brother-in-law, the recently recruited Francis Tresham, threatening to kill him, but Tresham managed to convince them of his innocence. At that stage Thomas reportedly asked Catesby to abandon the scheme, to no avail. When
Ambrose Rookwood through London, prompting Christopher Wright (brother of John) to rush to Thomas Wintour, and tell what had happened. Wintour guessed that the government was looking for Percy, and told Wright to travel to Percy's lodgings and "bid him begone". While Wintour lingered, Christopher Wright and Percy left the city, followed by Keyes, and then Rookwood. A renowned horseman, Rookwood covered 30 miles in two hours on a single horse. Using various steeds he had left along the route, he passed Keyes at Highgate, and then Wright and Percy at Little Brickhill near Dunstable. He caught up with Catesby, who had