An old Canadian flyer sled in the attic of Emily's new house transports eight-year-old Emily and nine-year-old Matt to a series of thrilling adventures in the past. Here, the sled takes the inquisitive pair to an old train -- one that's heading for Craigellachie, British Columbia, where the last spike will be driven into the rails to celebrate the completion of the Canadian Pacific Railroad. Will Emily and Matt make it in time for that historic occasion? Will they help reunite their new friend with his ailing father, a railroad worker?