Nana Marley has her heart set on more great-grand babies, and with the help of a folklore legendary rabbit, she might receive her wish.    Blurb for Derailed Hearts   Single father and ER doctor, Ethan Marley, is ready to put down roots. He and his daughter embark on a train adventure across Canada from west to east coast. Boarding the train, he meets a woman who steals his breath, and he learns that she too is headed to…