A cryptographer, losing touch with reality, discovers that his CIA handler is being exploited as a sex slave. To save her he must abandon his life's work.

Hi TOAST.

The element of his handler being exploited as a sex slave sounds almost comedic to me, but I’m not sure it’s intended like that. Maybe something like “held prisoner” would alleviate that. Also, the antagonist is elusive here. Clearly, it is whoever is doing the exploiting and the hero’s psychosis, but maybe it would benefit the logline to clarify where the main opposition will come from and why the adversary is so formidable to overcome.