Amy and Ty have a party. Jack and Lisa adjust to living together.Jen throws a party in honor of Lou. But all is not right with the proposition.Lou is left alone at Heartland when the pregnant mare, Melody, goes into labor. Tim's relationship with his jockey is not what it appears to be.When an unspoken attraction resurfaces, Amy discovers that honesty might be the best policy, but it certainly isn't the easiest one.A looming high school graduation and Spartan's near-fatal bout with colic force Amy to face where her future really lies.When Amy and Ty persuade Sarah, the town recluse, to let them treat her sick horse at Heartland, the family helps her face the ghosts of her past.Tim enlists Amy to ride Lightning Dexter in a big-time stakes race when he finds out his girlfriend, Janice, has teamed up with the competition.Amy and Kit have to put their differences behind them when they take on Caleb in a team-roping jackpot.When Amy is hired to do a horse clinic with a group of inmates, Ty is surprised to discover one of them is a friend from his days at the group home.When Ty and Amy find her father's stolen cattle, Tim convinces the family they need to take the law into their own hands.It's a week before Christmas when an anonymous call is received at Heartland about starving, abandoned horses trapped in an avalanche. Georgie becomes a fan of Amy's but then learns a dark secret.Some horse training issues have Amy and Caleb at odds, and Ty must mediate. Tim insists that everyone attend a holiday party.After their plans for a romantic getaway fall apart, Ty and Amy celebrate their first wedding anniversary at home, where Amy reveals some happy news.The road to parenthood for Amy and Ty is tricky, and paved with pregnancy issues, difficult decisions and plenty of family drama.Amy and Ty work to help a mare through a dangerous medical complication. Lou is taken aback after Mitch buys her a horse, and tries to interpret his gesture.Georgie is excited after being picked to be the Extreme Team headliner. Learning his mom is back in rehab, Ty blames his stepfather.Tim reconsiders letting Jack help with the rodeo school. Georgie begins to find Adam clingy.Georgie has regrets about having asked Adam for more space. Georgie asks Adam to tutor Wyatt in math.Amy helps the son of old friends connect with a horse. Someone breaks into Amy and Ty's home.

Lou and Lisa plan a reunion performance to celebrate Jack's birthday.When Shane arrives to stay for the summer, Tim tries to impress all three of his kids with a "really cool" Western day trip.When Ty visits Mrs. Bell to thank her for paying his school fees, he's surprised to learn she's moved out of her home and away from Sugarfoot.When Tim's racehorse Cisco is stolen on the way to his maiden race, Amy and Ty get help tracking him down from an unlikely source: Ty's stepfather.When Amy bravely tries to heal an abused and extremely violent racehorse, Ty and Jack think she's finally bitten off more than she can chew.Ty's mother, Lily, returns to Heartland with shocking news about his father and a secret that threatens her relationship with her son.When Jack learns Ty is riding his bike solo to a remote lake to spread his father's ashes, he decides to surprise Ty and join him for the trip.Trying to avoid hitting a wolf, Ty is badly hurt when he crashes his bike on a remote road, leaving Jack to search for help in the middle of nowhere.Amy is roped into helping Tim project a positive image to the community, in hopes it will further his custody case for Shane.When tragedy strikes, Amy must find a way to save Mr. Hanley's rescue horses from kill buyers.Amy and Ty join Scott on a trip back to his old reservation to save a herd of wild horses from the dangerous EHV-1 virus.When Amy's dog Lobo is injured by a trigger-happy rancher, it's up to Ty to save the dog's life.When a mystery horse arrives at Heartland, Amy and Ty are sent down a path that will alter their lives.As the new season begins, Amy is struggling to understand why Ty hasn't said a word about the engagement ring she discovered in his pocket.Amy is bursting to ask Ty about the engagement ring, and why he hasn't proposed yet, but a couple of "runaways" throw everything at Heartland into turmoil.Ty struggles to deal with the fact that Amy has found the engagement ring and has to decide how and whether he is going to propose to her or not.Tim hopes for a big commission when he helps a wealthy weekend cowboy look for his dream ranch, while Amy's stuck teaching his trophy wife how to ride.Amy tries to fulfill Mallory's dream of being a show jumper but discovers that it's Georgie who has the natural talent.Janice brings Cisco Kid (and her emotional baggage over Tim) to Heartland for Amy to figure out why Cisco's lost that winning feeling.Amy seeks out an up-and-coming show jumper (Jeremy) to learn why he's refusing Scott and Ty's suggested treatment for his horse.Chase Powers returns to Heartland with an aspiring "liberty horse" rider (Hayley) who wants Amy to be her coach.