What does it take to change history and destroy our reality? Change events on the same date, 14 February, in six different years. The Time Patrol must send an agent back to each day, with just 24 hours for each to defeat the Shadow's plan to disrupt our time-line, creating a time tsunami and wiping our present out.

Ivar: 1929. Gunmen massacre seven people in the infamous St. Valentines Day Massacre. Al Capone is consolidating his grip on the Outfit in Chicago. But what if it turns out very differently?

Eagle: 1945. President Roosevelt, heading home from the Yalta Conference, stops on the Great Bitter Lake to meet King Idn Saud of Saudi Arabia to discuss a relatively new topic: Arab oil. And a Jewish homeland.

Roland: 1779. Captain Cook, famed explorer of the Pacific, meets his fate in Hawaii.

Scout: 278. Saint Valentine is beheaded near the Milvian Bridge.

Doc: 1945. The Dresden Firebombing. Kurt Vonnegut is in a slaughterhouse as the first bombers appear overheard.

Moms: 1946. The ENIAC computer, programmed by six women, is unveiled to the public. The press thinks the women are simply models.The mission, as always for the Time Patrol, seems straight-forward: keep history intact. No matter the cost.

But this time, things go very differently than in previous missions and one of the team members must make the ultimate sacrifice.