In 1961, a British double agent is blackmailed with his past crimes by a former colleague, and forced to spy on a suspected Nazi war criminal, now an American jet-setter living on the French Riviera.

Thanks for the feedback, everyone. Thanks for the loglines, Robb Ross. I'll see what I can do.

Still on my mind...

In 1961, a retired British agent who's guilt-ridden over his collaboration with the Germans in WWII is blackmailed into capturing a Nazi war criminal living a jet-setter life on the French Riviera.

That's a smoother logline (not great), but still raises a few of the wrong kind of questions. .

Agree. Some improvements and still some questions.

If his past crimes are known early on, then they should be in the logline even if it means a longer log. If they're not revealed until later, then hint to them and tell us who he is today.

Spying sure seems like the first step of a greater objective so is there more to say about the job?

What's the conflict? Is it difficult for this former agent to spy? Does something go wrong?

If the main stakes are about the protag, then we should care about him or relate to him. Usually someone is blackmailed into something they wouldn't normally do.

Here's an example of a sharper logline (not great as that takes more time and this isn't about trying to shape the story):

In 1961, after hearing of a Nazi living large on the French Riviera, a retired British agent troubled over his wartime actions befriends the man as part of a scheme to bring him to justice. ?