Amy is surprised when a very pregnant Mallory shows up at the ranch with a wild horse; Jack and Tim face new competition, and Lou grapples with a familiar opponent in her campaign to be reelected.
Amy and Jack retrain Edwin's horse for carriage racing, bringing Amy and Edwin closer; Logan takes on his first client horse; election night arrives for Lou just as the family faces a difficult loss.
Amy helps Caleb with his son's pony; Lou and Jessica start a new venture, while Katie tries a risky new hobby; Logan takes a big step in his relationship with Miley, but then disaster strikes.
Amy must deal with Lyndy's sudden fear of horses; Logan blames himself for Miley's accident; Tim enlists the family to make Shane's return to Heartland perfect, while Katie struggles with a friendship.
Lou is forced to face the reason for her insomnia. Amy works with a new client and surprisingly she has a connection to Katie. Jack wins over a ranch guest.
Amy helps a vaulting team ahead of a big competition; Caleb struggles with a tough decision about Carson; Logan realizes where his future lies; Lou and Jessica face a stressful gallery opening.
Amy and Nathan retrain his horse; Tim navigates new family dynamics when Miranda shows up early to help with Shane and Chloe's wedding; Jessica has to heal a rift with Jack.
An accident puts Shane's wedding in jeopardy; Nathan tries to make amends with Amy while helping his traumatized horse; Heartland Beef faces an uncertain future; Katie finds a new side of herself.