A 15-year-old boy is taken from a wealthy New York family and held for ransom.

The Cains receive an alarming parcel in the mail, sending Knapp to find Aubrey, and Conrad to his father to talk about his past.

At the insistence of Knapp and King, the Cain family hosts their annual charity ball to avoid suspicion that Leopold has been kidnapped.

Lattimer asks Lucian to apply at a private military company in order to fish out the name of Virgil's shooter. Meanwhile, Leopold requires a doctor.

Knapp and King figure out the name of one of the suspects and race to find the criminal mastermind. Leopold desperately tries to get to a cell phone before the battery dies.

Ellie's father, Benjamin Rand, steps in and takes over to get Leopold back and he's willing to do anything to get his grandson back. Knapp and King continue searching into the Cain's shady past. Conrad is arrested.

The story of the kidnapping is leaked to the press. Knapp finds out that the Cain's might have known all along that Leopold was a possible target for the kidnapping.

Leo's captors find out about the burned money, and The Operator makes a move. Emails provide new information about Virgil as he puts himself up as bait.

Torture of the Accountant produces results that endanger Knapp, and Virgil gets assistance from someone in the Cain family.

Lucian tracks down and captures Vivian Guttman, but the foresighted mastermind behind everything sets a contingency plan in motion, threatening the life of Latimer's daughter in return, so Lucian summons an ace-in-the-hole for help.

Dissension in the kidnappers' ranks creates an opportunity, and an inside man is found.

Knapp and King close in on Leo's location, but more people add themselves to the equation on both sides; a letter brings a clue.

Leo's home, but King can't let go of finding out the cause for everything.