Will Danielle finally discover the truth about her sister? That's the main question on the minds of Covert Affairs fans following last night's "Sad Professor."

Perhaps we'll find out on next Tuesday night's summer finale. Titled "World Leader Pretend," Annie's mission will be to help a Chinese scientist defect, but look for this task to cause a problem with Danielle.

And be sure to check out the closing scene of the following promo, which offers quite the interesting tease: