It was sparked by the failure of the Exclusion Bill, and it designed to kill its targets on their return from a Newmarket horse meet.  
This event was discovered by Leoline Jenkins, and a report on it was written by his successor, the Earl of Sunderland. One participant in this event gave a speech in which he claimed "none comes into the world with a saddle on his back, neither any booted and spurred to ride him"; that man was Richard Rumbold. This event grew out of meetings at the house of a London wine merchant named Sheppard. Thomas Ferguson and Robert Armstrong were executed in its aftermath along with the author of the Discourses Concerning Government, (*) Algernon Sidney.  It was sparked by the failure of the Exclusion Bill, and it designed to kill its targets on their return from a Newmarket horse meet.  It resulted in the suicide of the Earl of Essex, though more notably implicated was the Duke of Monmouth, who went into exile.  Actually real unlike the Popish Plot, for 10 points, name this plot to kill Charles II and the future James II at a namesake Hertfordshire dwelling.
This event was discovered by Leoline Jenkins, and a report on it was written by his successor, the Earl of Sunderland.
{Rye} House Plot