In Trinity Church, Ian agrees to hand over the Declaration if Ben reveals the next clue. Ben doesn't have much room to argue, as Ian has taken Patrick hostage. Using the glasses, Ben finds out they need to look "beneath Parkington Lane," a reference to a crypt in the church, complete with Masonic symbols. Inside, they find a tunnel leading underground.
After encountering several booby traps, the treasure hunters hit a dead end, lit by a single lantern. Patrick makes up a fake clue, telling Ian that the lantern represents the Old North Church in Boston, where, in 1775, Paul Revere lit two lanterns to warn that the British were coming. Patrick's gambit works, and Ian heads for Boston ... leaving Team Ben trapped underground.
However, Ben finds a hole in the wall that fits the bowl of the meerschaum pipe. With the pipe in place, a door opens, revealing a room full of treasure and, perhaps more importantly, stairs.
At the top of the stairs is Agent Sadusky, who turns out to be a Freemason. Ben hands over the Declaration, and in exchange for telling the FBI about the treasure, he gets clemency for everyone in his party, credit for the entire Gates family and Riley (sorry, Abigail), and a 1% finders fee. He also tells Sadusky where to find Ian. As a result, Ian is arrested, Ben and Abigail become a couple, the Gates family is proven right about the treasure, and Riley buys a Ferrari.
