Esther Drummond

Esther Drummond was a CIA agent in the 21st century.

Biography
After witnessing the Torchwood virus removed data from the CIA database, Esther decided to investigate as she felt responsible for the injuries her colleague, Rex Matheson attained.

Esther found information about the Torchwood Institute, Captain Jack Harkness, and Gwen Cooper, precisely when Jack Harkness found her. They were forced to jump from a window to escape a suicide bomber. Jack Harkness told her all about Torchwood before drugging her with retcon. (TW: The New World)