The Roland brothers Josh and James, not on speaking terms for years, inherit a fortune from their eccentric, astronomy-obsessed father, but in the form of an intricate treasure hunt. Time presses as their only offspring is kidnapped by the infamous Brett Gelles. Pressed for time, Neal takes charge of the clues while the FBI tracks down the hostage. Meanwhile Mozzie plans to sell off a Degas from the Nazi treasure, but Neal learns about a partially preserved manifesto rendering that too dangerous.

When a mobster from Mozzie's Detroit childhood surfaces in Manhattan, Neal and Peter must help their friend rework a scam from his past to take down the ruthless gangster and prevent a mob war.