Michael uncovers unbelievable news when he seeks revenge for Sara's death, Michael and Lincoln receive an offer from Homeland Security that they cannot refuse, Mahone suffers a terrible loss, and T-Bag is abandoned during his flight to freedom.

Michael seeks revenge against Whistler and Gretchen and uncovers unbelievable news. Lincoln and Michael are reunited with the gang and get an offer from a Homeland Security agent. Mahone experiences a devastating loss and T-Bag is deserted.

Michael and the team have a day to find the next cardholder, or they risk going back to prison. Mahone seeks revenge on Wyatt, who is attempting to get information on Sara's whereabouts. T-Bag finds a new identity and gets a job offer.

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.

Michael and Lincoln's search for the next of the Company's secret key cards takes him to the Treasury Department. Meanwhile, Sucre and Bellick continue to track T-Bag, who arouses suspicions and forms an uneasy alliance at his new job, and Wyatt uses his personal touch with Gretchen.

Michael and the team tracks a key card holder to a racetrack. Mahone gets caught with something priceless. Wyatt targets Agent Self. T-Bag starts to figure out Whistler's code.

Lincoln and the team go to Las Vegas where Sucre gets an indecent proposal. Sarah finds out about Michael's condition. Roland pushes his luck. T-Bag and Gretchen team up. The secrets in Whistler's bird book are revealed.