Four's a Crowd (1938) on Netflix

Jean Christy is a newspaper reporter, who is out to get the story at any cost. Her ability to do so may be in jeopardy when the newspaper's young and generally invisible owner, Patterson Buckley, decides to shut it down. The one person who Jean believes could convince Pat not to shut it down and to resurrect it is the newspaper's former editor-in-chief, Robert Lansing, who Pat previously fired. Bob owns his own PR firm and is out to get the account of John P. Dillingwell, one of the wealthiest men in America but also the most hated and who has a penchant for miniature trains and sicking his attack dogs on people he doesn't like. He is hated because Bob secretly led a smear campaign against Dillingwell when he was editor-in-chief all in the name of Dillingwell figuring he needed a good PR person. In trying to get Dillingwell's business, Bob goes after Dillingwell's granddaughter, Lorri Dillingwell, who happens to be Pat's fiancée. The secret identity of a H. Louis Brown adds another layer of complexity into the proceedings. As each of Bob, Jean, Pat and Lorri do whatever they need to get what they want professionally, their personal lives also mesh, with it never too clear which boy is with which girl and if any boy will end up with any girl.