Lou returns from Vancouver with an admission that threatens to change the Heartland family forever. Meanwhile, Jack intervenes when he discovers that Tim intends to crash Miranda’s wedding in Moose Jaw. Then, when Amy helps Caleb source a horse for Tim’s rodeo school she learns just how precarious Caleb’s business partnership is with Jesse. And Georgie fights disappointment when it looks like Peter won’t make it home to take in the lunar eclipse with her, as promised.