When someone sets a nuke off, Frank is sent back to avert it. They give him what info they could get on who may have done it. However because of a mistake on Frank's part, the sphere gets sent back without Frank. So they inspect the sphere and find Frank's bag and inspect it and the only item that doesn't appear to be among the things he usually brings with him is a key. That's when Isaac decides to bring in a girl who is a psychic, whom he worked with years ago when she was around nine and who decided to stop working with him because she couldn't fully comprehend her visions.