Thanks to their case worker, Mrs. Kelly, Elizabeth and Conner MacBride make it onto the orphan train heading into the west. Mrs. Kelly is reluctant to part with the children as she struggles with the agreement she was forced to make with Sister Mary Clare to keep the children on the train. If Mrs. Kelly keeps her promise, she will keep her job but she may break the hearts of Elizabeth and Conner in the process. As the train makes its final stop, Mrs. Kelly must choose, place the children with strangers or return them to the Catholic Foundling Aid Society's home in New York City under the direction of Sister Mary Clare, something she does not want to do. Living in a small cowtown in the Kansas territory would be a new and frightening experience for Elizabeth and Conner but with the help of a few good people they might be able to make new lives for themselves. Will Mrs.Kelly have to sacrifice her job to do what she believes is best for the children or can she find a solution with which they can all live?