When Dr. Jackson Clark walked back into Dr. Ava Grant's life holding a box filled with clues for a mystery to solve, she was barely cognizant of the adventure it would lead them both on. Together, they traverse the planet and travel through time to uncover how to return a missing person to her own home and time stream. On their journey, Dr. Ava Grant and Dr. Jackson Clark learn that they are both holding onto the love that united them years ago.