Young cop Roisin secretly helps Fiona in uncovering clues that suggest foul play. As Fiona digs deeper, she discovers a web of criminal activity involving horse thefts and cons run by the shady Patsy Burgess.

Fiona's mother, Mary, arrives to take her back to the U.S., but a visit to a grave and an unexpected encounter with an old flame force them to face old wounds and unexpected truths.