New York, NY, 1963. Two young women are brutally murdered in their Upper East Side apartment. If these girls aren't safe, who is? The NYPD is under pressure to solve the high-profile case but make a tragic misstep while investigating.

Denver, CO, 1955. United Airlines Flight 629 explodes in mid-air, killing everyone aboard. Crash investigators wonder if it was an accident at all. What follows is the discovery of the first-ever act of murder-by-airplane-bombing in the U.S.