What makes a great movie? Good acting and a great plot twist at the end.
So, thinking logically:
During the election, it becomes obvious that there is considerable corruption in the FBI, the DOJ, some congressional leaders, and the DNC.
Trump appoints Sessions, who has historically been a straight arrow. Once in office, Sessions realizes the extent of the corruption at FBI/DOJ. Sessions brings in Rosenstein, who has been a corruption fighter and NOT a swamp creature. Rosenstein is also not politically ambitious have remained AG/Maryland for 12 years.
In assessing the situation at FBI/DOJ, Sessions and Rosenstein realize the severe extent of the corruption. If they went straight ahead and began a public investigation into FBI/DOJ, the network of corrupt officials inside would block, misdirect, not cooperate, destroy evidence, etc. They appeal to a judge or a panel of judges to get approval for a sting operation.
Needing investigative talent and having no-one inside FBI/DOJ they can really trust, they enlist the help of military intelligence. Note that Sessions was on the on the Armed Services Committee so he knows the players and who he can trust.
Sessions (appropriately) recuses. Rosenstein appoints Mueller, who they suspect is corrupt. Mueller brings in a team of political operatives with a plan on finding any damning evidence on Trump, while at the same time, covering-up past misdeeds surrounding HRC investigation and Comey leaks (among other crimes).
Unbeknownst to Team Mueller, all of their actions and communications are being monitored. Through this monitoring, they collect evidence of Team Meuller’s wrongdoing and also learn the connections of the Washington corruption network (ie Page, Strzok, McCabe etc.).
While the Mueller investigation is going on, Sessions, Rosenstein, and Wray collect significant evidence of corruption and start flipping witnesses. It could be any number of things: HRC Server, Tarmac Meeting agreement, Clinton Foundation, Weiner laptop, Huma/MB, DNC leak, Awan, who knows.
The problem is that Team Sessions can’t appoint a new special counsel or start bringing charges because it will be seen a purely political. They need a Democrat to do it but they can’t just hand it to Mueller and tell him to investigate. He is completely independent. He could just tell them “no” or declare that it is out of his purview.
So they take their evidence of crimes and give it to Cohen. They find Stormy, an old acquaintance of Trump who can act and who’s history fits the part (also, you know she’s libertarian/Republican, right?), they concoct a salacious story, fabricate some documents, and just when it seems Team Mueller has hit a dead end, Team Sessions releases Stormy on the world. Both the media and the Democrats/Never Trumpers bite: They think they sunk Red October. Indeed, they are so convinced that they begin drafting legislation to prevent anyone from firing Mueller.
At this point Team Sessions has evidence of Team Mueller wrongdoing, and also knows that Team Mueller is in possession of evidence of Dem/Never Trumper crimes. They send in Rudy (a career prosecutor) to tell Mueller that he has his choice between going to Leavenworth and investigating the Dem/Never Trumper crimes. (I am not certain, but I would imagine that the Special Counsel has some obligation to investigate or at least report evidence of a material crime.)
We will see if this is at all close if Mueller’s investigation takes a turn away from Trump/Russia/Stormy and turns toward Democrat corruption.