When her acting career does not take off, but her sister does with her fiance, Reba returns home to become a preschool teacher, and director of the Christmas pageant. After his wife dies, widower Seth Webster moves to town with his rambunctious twin boys. Mrs. Merkle, who is dubbed 'Mrs. Miracle' by the boys, is hired as a nanny and soon has the boys behaving nicely. It isn't long before Mrs. Miracle is sowing the seeds of love for Reba and Seth too....

Follows the continuing story of teacher Elizabeth Thatcher, widow Abigail Stanton, Constable Jack Thornton and the other residents of the 19th century Canadian coal mining company town of Coal Valley.