Gemma Hart never knows when her father is going to whisk her back in time. Her toes start tingling and she has a few minutes to find a secret haven where she can disintegrate and appear in another time and place. While "across the line," her training and skills are put to the test as she completes a mission that will change history for the lucky few her father has selected. Gemma's parents are adamant that secrecy is paramount to her family's safety. If people knew what they were capable of, they could be "used and abused", as her mother always says. Afraid she might accidentally utter the truth and break the ancient oath of her people, Gemma spends her school days as a loner. Only one thing can throw her sheltered life askew... Harrison Granger. Harrison never expected to talk to the strange Hart girl, but after a brief encounter he can't stop thinking about her. He begins a campaign to chisel away her icy veneer and is met with unexpected consequences. As he slowly wins this girl over, he enters a surreal world that has him fighting to keep his newfound love and his life.