There has been a jail-break and two ensigns from security and a civilian are trapped by the escapee on the holodeck. They’re going to have to play through the scenario in order to catch him.
Also, as Discovery is transitioning to this alternate universe McCarris has found that he has no alternate form in this universe. He seems to be slowly fading not only from memory, but from reality as well. Doctor Vashic and Science officer Shralas are on the case, though currently only one of them can see him.