The simplest motherfucker of a plot is this: things get worse until they get better. A straight-up escalation of conflict. It goes from "Uh-oh, that`s bad," to, "Uh-oh, it`s getting worse," to "Oh, holy shit, it can`t get any worse," to, "I think I maybe fixed it, or at least stopped it from being so totally and completely fucked." When in doubt, just know that your next step as a storyteller is to bring the pain, amp the misery, and escalate the conflict. That`s what they mean by the advice, "Have a man with a gun walk through the door." You can take that literally, sure, but what it means is: the bad news just got worse.