A dowdy secretary named Sylvia Brenner (Constance Bennett) agrees to marry her rich, divorce lawyer boss Gaylord Stanton (Kenneth MacKenna) so that he can avoid a marriage to one of his regular clients. The deal is that Sylvia will get a great allowance and the ability to travel anywhere she wants. While on a trip to Paris she begins to find herself and develop into a confident, uninhibited woman. She attracts one of Gaylord's cad friends Reggie Durant (Basil Rathbone) and contemplates an "affair." The film is a early b-studio talkie which is notable for its frank treatment of moral dilemmas a
You can stream Sin Takes A Holiday (1930) free and legally on alltube, via the Internet Archive.
Yes — it is in the public domain and can be watched and shared freely.