Georgette Heyer's 1936 novel may be propelled by the French revolution, a stolen ring, and an English nobleman wrongfully accused of murder, but adapter Christina Calvit focuses on his rescuers--among them two charming young viragos enamored of Ann Radcliffe's shivery thrillers. The results make for a tea-and-swashbuckling romp even more giddily playful in this revival than it was in Lifeline Theatre's 1996 premiere. Kevin Gawley's labyrinthine set, Elizabeth Powell Shaffer's fairy-tale costumes, Victoria DeIorio's rousing incidental music, Geoff Coates's exhilarating fights, Ann Wakefield's perfect dialects, and Dorothy Milne's nimble cast deliver lighter-than-air intrigue sure to please romantics of all ages. Through 12/11: Fri 7:30 PM, Sat 4 and 8 PM, Sun 5:30 PM. Lifeline Theatre, 6912 N. Glenwood, 773-761-4477. $24-$26.