Michael and Lincoln's search for the next card key brings them to the Treasury Department; Bellick and Sucre look for T-Bag; Wyatt and Gretchen get personal.
Michael, Lincoln and Sucre have to crash a police benefit to get the next card key; Sarah falls back into an old habit; on his first day of his new job, T-Bag runs into some old friends and arouses suspicion.
Mahone finds resolution; Gretchen and a Company man get cozy; Michael's medical condition gets worse; a member of the team makes the ultimate sacrifice in the search for Scylla.
The Bancroft family calls on Brennan and Booth to investigate the stabbing death of Terence Bancroft; Agent Sullivan invites Brennan to his basketball game.
Lincoln and Sucre target Pad Man to obtain the final card key; Gretchen gives Sarah an opportunity to settle the score; Michael and Roland make deals with different devils.