Tyler loves his wife more than anything and he will do anything to protect her. With her he was everything he wasn't before and he had a home, a place , he was loved for just what he was, and for him that was something he never wanted to lose and that is why he lies to her. They told him to. Its part of his job and he understands it. Being a CIA agent isn't something simple and if lying means she will be safe . He will do it for her. But and accident stopped him from finishing one of his missions and left him in coma. As Kate starts to see things that he used to cover, soon she discovers who her husband really is, a complete stranger, but now she has to finish what he started if she wants to stay alive. All the broken pieces are now in her hands.