"She's No Lavendra" is a contemporary "princess story" inspired by Cinderella but with the darker elements of international intrigue, paramilitary action, palace plotting, secrets ancient and modern, murder, and chocolate.
Logline: An angry young American single mother agrees to marry the ratfink prince who done her wrong before he dies (good riddance!) and so provide the heir his country desperately needs.
Romance? Of course -- four royal romances across generations. And a happy ending.
Long enough for a TV mini-series. Has hooks for sequels and prequels of various genres.