Nina Miller and Sean Wade are a pair of FBI partners. They both work for a team within the FBI called UC (Unknown Cause). In their work, they often encounter strange, inexplicable and unexplained cases, and their mission is to find out the reasons and find out the truth! This time they will go to Texas to face a series of bizarre incidents of dehydrated mummies. The traces of their opponents are confusing, and murders are still happening. They need to use their professional knowledge and wisdom to find the truth as soon as possible...