In the Season 4 finale, the guys are almost able to retrieve the evidence box from the Empire State Building, but their efforts are impeded by Senator Pratt, who hired FBI agents to find the box first.
Peter and Neal look into Senator Pratt's ties to corrupt cops who framed Neal's father. Their investigation also leads them to a real-estate developer running a kickback scheme.
Martin crosses paths with a young man who has a history with his deceased wife, Sarah. A couple managing an online instrument repair business work with an Iraqi heavy metal band that has a teenage follower who is looking to share his comedic talent with an American soldier (guest star Sprague Grayden) in Baghdad. But the soldier has troubles of her own when her convoy is ambushed, forcing her to hide in the Iraqi desert. Then, a lottery winner comes upon a depressed pastor.
Martin crosses paths with a man who has a history with his dead wife. A Iraqi teen is looking for an American soldier who has been forced into hiding.
International paths intersect.
A failed jewelry store robbery results in a murder that finds Nick (David Giuntoli) and Hank (Russell Hornsby) immersed in a hunt for rare coins. Nick soon learns that these coins have an unsettling effect on whoever possesses them, as Hank and Captain Renard (Sasha Roiz) begin to exhibit unusual behavior. Meanwhile, a mysterious old friend of Aunt Marie’s (guest star Titus Welliver, "Lost") comes to Nick with information about his family and what led to his parents' death. Bitsie Tulloch, Silas Weir Mitchell and Reggie Lee also star.
The search for a murder suspect leads to powerful rare coins and answers to Nick's past -- Titus Welliver guest stars.