Line Engaged is a 1935 British, black-and-white, thriller directed by Bernard Mainwaring and starring Bramwell Fletcher, Jane Baxter and Arthur Wontner. It was produced by British Lion Film Corporation.
Eva Rutland (played by Jane Baxter), the wife of caddish Gordon (Leslie Perrins), is in love with David Morland (Bramwell Fletcher), a successful novelist. David's father, an Inspector (Arthur Wontner) gives his son a cast iron murder plot. Later, when Gordon is shot, it seems David has fulfilled his father's hypothetical musings.