This wasn't a series we ever watched in reruns or syndication, so my only viewing of this episode was when it originally aired. Some forty years later, I didn't remember much about it. LOL But when I saw the helicopter, suddenly I remembered the following sequence. :-)
The show starts out with a couple of fairly standard tropes ... the spy who passes on information just before he's killed, then the spy who passes that information on to a civilian. After that, the story goes its own way, with a wayward message ... accidentally discovered ... that only a housewife might understand. Then you have another standard spy trope ... an odd way of passing on coded information. Forget that the method makes no sense compared to other possible methods, the show is good run and worth the watch.
The show starts out with a couple of fairly standard tropes ... the spy who passes on information just before he's killed, then the spy who passes that information on to a civilian. After that, the story goes its own way, with a wayward message ... accidentally discovered ... that only a housewife might understand. Then you have another standard spy trope ... an odd way of passing on coded information. Forget that the method makes no sense compared to other possible methods, the show is good run and worth the watch.