Looking for show title

I just thought of a show I watched. There was a young African American girl and a guy. They were investigating something together. I remember there was some type of substance involved. She was working with the US government but also giving info to her Agency in another country. She thought her father was dead but he was not and it seemed as if he actually was involved in the whole mystery. I believe there was also something about the substance or mystery item being able to influence weather. It is driving me crazy and I cannot remember the name. Thanks