He is investigating the Russian influence over the election and any ties that relate back to Trump and/or Trump surrogates. His report will be short, in the form of an executive summary-type report of his findings. From there, the DOJ (in this case, Rosenstein, the Deputy Attorney General....because his boss, Attorney General, Jeff Sessions, had to recuse himself over....you guessed it, contacts with Rusdians during the campaign!) determines if there is any legal jeopardy and whether they go ahead with any prosecutions. The Special Counsel is the ex-ex-Directorof the FBI, Robert Mueller, who is widely regarded as the premier law enforcement professional of the last few decades. Thorough, discreet and above reproach...a true "country before politics" type individual. It will get interesting, especially if there is any "there" there!