A blizzard that causes a citywide blackout, the team must think of creative ways to solve a murder case that could be connected to a possible viral outbreak of Crimean–Congo hemorrhagic fever (CCHF). Booth and Brennan are trapped inside the elevator in Booth's apartment during the blackout, with Sweets outside where he starts a touchy conversation concerning their relationship. Meanwhile, Angela and Hodgins receive troubling news that could affect their unborn child.