 He was admitted as a Jesuit novice by Father Henry Garnet in 1600.While waiting to go to Flanders for his novitiate, Fr Filcock was apprehended, betrayed by a former fellow student at Valladolid and sent to Newgate prison in London.In 1601, Fr Filcock was charged for being a priest but he would neither admit nor deny, insisting that witnesses and evidence be brought forth.