The premise involves 18th century spying, and while it boasts a serviceable cast, the final product doesn't quite succeed. Jean Kent portrays "Helena," a woman who enters marriage with a man near death so she can gain control of his property. As expected, he soon passes away, and she becomes tangled in a plot that includes a stiffly acted Guy Rolfe as her new relative, "Lord Carylon," alongside Paul Dupuis, who isn't…