Sydney found herself face-to-face with her long lost mother Irina Derevko, and her intentions towards her daughter were chilling. However, Sydney successfully escaped and fled Taiwan with Jack and Will. After returning to Los Angeles, Sydney continued to search for Vaughn, unsure if he was alive or dead after being washed away by a water wall in Taipei. When Will learned the truth about SD-6 and Sydney being double spies, his life changed forever. In addition, Dixon must decide whether to inform Sloan of suspicious activities in Sydney. But Jack intervened and covered up Sydney. Sydney later found Vaughn, who helped her find her mother Irina, who was searching for a Rimbaldi artifact called the Bible