A London worker, who is part of the Crossrail digging project, unearths Joan England who has been hidden in the ground since 1290. She is an English Jew who refused to leave England when deportation or death was the order. Concealing herself as a Catholic, and later a Protestant, she time travels back to 1656 and meets the rabbi who tries to convince Oliver Cromwell to allow Jewish return. When it fails she shoots forward to modern Israel where she meets the biblical Sarah. Joan, who has become an evangelical Christian, wants to baptise Sarah to help the conversion of the Jews and the impending Apocalypse. She succeeds and thereby seemingly hastens the end of the world. The play is a satire on English history and religious fervour.