Alan Pape, a longtime veteran of the police department, is hired by Tom Davis to run a lucrative private-security operation in Summit. After a break in Olivia's case, Eric's sister Petra queries Summit police officer Nate Henry about alibis, and heads to Louisiana to track down Joel, who's relocated there with Laura. Reluctantly, he agrees to return to Summit with Petra, and ends up scouring the local bars in search of a mysterious intruder.

Though he has suspicions that the wrong man is in prison, Nate faces major obstacles as he tries to get a subpoena on a closed case. Eric is dogged by allegations stemming from an earlier mysterious death. An increasingly paranoid Joel weighs his options as evidence against him mounts.