Lachlan Buchanan

Aria, Emily, Hanna and Spencer are on the quest for answers of what Alison knew before she died, and they might have just got a big lead when someone from Alison's past appears.

One father has a guilty conscience, one has a daughter he doesn't trust, one is hiding a secret from his daughter and the other is MIA, it's not the ideal time for the annual Father-Daughter Dance.

The team welcome back Emily Prentiss when they are called upon to investigate the disappearance of three women.

Ben, Jackson and Emmett are put in a precarious and dangerous position with a potential victim.

Andy becomes suspicious of the circumstances surrounding her mother's death. The crew works to evacuate a doctor from Pac-North hospital and find themselves in a life-threatening situation. Sullivan undergoes surgery for his chronic leg pain.

As Ben readies the new Physician Response Team truck for the field, his suspicions about Sullivan and the missing Fentanyl continue to grow. Jack and Rigo try to look past their differences when they are forced to work together.