While trying to help Cass learn to handle a spirited horse, Amy discovers there is more riding on their success than she initially realized. Meanwhile, Tim insists the entire Heartland family attend a Hudson holiday party where Lou is forced to deal with a series of unexpected events, not the least of which is Peter's sudden appearance. When tragedy strikes at the Wildlife Reserve, Georgie risks her life to save a herd of miniature horses and Ty steps in to offer support when Bob's dream of expanding the Reserve goes up in smoke. Meanwhile, when Remi destroys his new fly- fishing bait supplies, Jack holds onto his grudge against the dog in order to win a bet with Lisa.