What a gem! Gripping from the opening shot - a close in shot of a test tube containing wriggling meal worms and EGAD! Frances Grey (Margaret Lockwood) scared the daylights out of me...I know there must be a woman beneath all of that makeup somewhere. Guilted into accepting a secret assignment to smuggle some insects of vital importance out of a highly dangerous, Communist-Russianesque country. Face lacquered, eye brows painted, false black eyelashes glued in place, Frances Grey aka Frances Conway, Entomologist, boards a train to her destination. Unfortunately, she's not only untrained to act as a secret agent, but her compartment mate is the Chef of Police in Grenze Granitsa - Anton Rasinsky (resembling the offspring of an evil Captain Kangaroo and Samuel Clemens). He's onto her from the get-go. Fortunately for her, Bill Casey (a terrific Dane Clark) hones in on her at her rendezvous point, the Café Mimosa. Casey takes Conway for a little drive, apparently too much of a gentleman to be embarrassed by her completely ghastly pair of cat's eye sunglasses. Her contact has been murdered, she's arrested by Rasinsky, yet somehow the Klieg lights don't melt her makeup. She's injected with the ubiquitous "truth serum", spouts nonsense, and is thrown into a filthy cell. Wilfred Hyde White plays the British Charge d'Affaires. Then, the real fun begins. There's tension, chemistry, romance, some humor and a twist. The story is well-paced, well-written, alternating between darkness and light. The scene near the end of the rousting of train passengers in Grenze Granitsa shows a cast of extras straight out of a Fellini movie - great faces!