Alias - Season 4 Episode 14 -

Vaughn and Sydney, searches for Vaughns father, and the word Nightingale. Getting help from her father, telling him that Vaughns father might still be alive. Jack Bristow and Sloane have their own agenda. Following Jack Intel, Sydney and Vaughn goes to Munich. Dressed as a German beer maid, Sydney roughly pursued an investment banker to give her information. They find out that Nightingale is still an active experiment, in an atomic plant in Siberia. They go on a mission to the plant. Which turns out to be very dangerous for both Sydney and her father.