There is a terrific moment that occurs after Walter's mom refuses to speak to Carrasco and he trips and falls in a sea of bicycles at a community college bike rack. That human moment changes the dynamic of the relationship of the mother and the investigator. She then permits him to take possession of the recorded tapes from the "Homecoming" facility. The tapes will be used by Carrasco in an attempt to jog Heidi's memory about what happened to Walter and why Heidi left her job at Homecoming.
In the meantime, the truth has begun to emerge about Colin's role in the duping of the vets being treated at the Tampa center. It turns out that Colin's goal was to erase painfully memories from the minds of the vets through the use of an experimental drug given to the men without their knowledge or approval. With the their minds cleared, the vets will promptly be sent back to the duty in America's seemingly ending string of foreign wars. But the side effects of the drug are unknown.
The brazen Colin, using the alias of "Hunter," has wormed his way into the Heidi's life to the degree that he will now accompany her back to the "Homecoming" center to search for a man she recalls from her past by the name of Colin.