Identical twins meet as teenagers after Sutton was adopted by a rich couple and Emma grew up a foster kid. Sutton investigates their bio mom etc., while Emma takes her place/identity.
Peter returns from Dubai to find out what's going on with Lou. Amy and Ty convince Sarah, the town hermit, to let them treat her sick horse at Heartland. Badger and Mallory go on an adventure neither of them will soon forget.