In 2043, the time machine malfunctions forcing the team to abort Cole's return. Dr. Jones sends Ramse and Whitley to Spearhead to get the stabilizer they need the get the Core functioning functioning properly. Spearhead is run by Col. Jonathan Foster and is dedicated to finding a cure to virus. He clearly doesn't have much faith in Jones' project to change the past. When Jones tries to bring Cole back, she damages the Core beyond repair. There is only one place to find a replacement. In 2015, it's the week of the Chechnya explosion. Cole's body was never found in the debris and Cassie travels to Chechnya to confirm that he is dead.
—garykmcd