Sophia Bush

Detective Erin Lindsay sure gets around!

In addition to her weekly appearances on Chicago P.D. (Wednesdays, 10/9c, NBC), the character (played by Sophia Bush) popped up on last week's episode of Law & Order: SVU and has been a frequent presence on Chicago Fire due to her help in the search for Severide's kidnapped sister.

'90s stars: Where are they now?

But despite her popularity, Detective Lindsay has kept her cards pretty close to the vest thus far about her personal life. Where is she from? How did Sgt. Hank Voight (Jason Beghe) save her life way back when? Why is he so protective over her now? And, most importantly, what is going on with Lindsay and her partner, Halstead (Jesse Lee Soffer)?

Check out this exclusive video to get the scoop on the secretive Lindsay (or at least what we know so far):

Chicago P.D. airs Wednesdays at 10/9c on NBC.