S3, E5: Syd breaks into Simon Walker's room only to find that the bio-weapon is gone - he has sold it to Sark. Lauren senses Syd may be hiding something about Vaughn's stabbing, but must find a way to work with her husband's ex after Sloane is abducted by an African arms dealer rescued from prison by Sark. Jack risks blowing his cover to grill Simon about Syd's lost two years.