The identity of the mysterious “St. Aidan” forces Sydney to pull a stunned Will out of witness protection. But the pursuit sends the two old friends on a collision course with Allison — the woman who ruined both their lives. Meanwhile, a zealous Lindsey arrests Jack and Vaughn as conspirators in Sydney’s escape from NSC custody, Sloane, still under pressure from Lindsey, puts a plan in motion to eliminate Sydney, and Dr. Brezzel has an unpleasant run-in with Sark.
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