A spy in London sends an urgent message to America. Mary impedes Abe's attempt to restart the spy ring. Benedict Arnold arrives in camp.

Abe gathers intelligence in New York. Simcoe escapes his punishment. John André attends a ball in Philadelphia and meets Peggy Shippen.

Ben sets a trap to capture a traitor in camp. Richard discovers Abe is conspiring with Major Hewlett. Caleb collides with Robert Rogers.

Abe tries to recruit a new agent; Caleb and Rogers race to hunt down intelligence from London; Andre's history is exposed.

Abe makes one last effort to recruit a spy inside New York. Ben must determine who is a double agent.

Anna, Ben, and Caleb devise ways of rescuing the abducted Major Hewlett. Mary attempts to motivate Judge Woodhull into action.

George Washington teeters on the edge of madness. Abe and Hewlett endure great hardships at the hands of their respective captors, though the latter's ends unexpectedly.

The French join the fray. Caleb makes an uncomfortable trip and Abe makes an even more uncomfortable choice. Robert Rodgers finds himself unexpectedly unemployed.

Abe returns from prison with critical intel. Tensions rise between Hewlett and Simcoe. Arnold rescues Peggy from a rebel mob.

Abe plots to assassinate Major Hewlett, then receives a proposition from an unlikely ally. Ben fights at the Battle of Monmouth (June 28, 1778). Benedict Arnold continues to covet Peggy Shippen.

In the third-season premiere, Abe covers up a murder with an unlikely accomplice. Elsewhere, Benedict Arnold abuses his power as he settles into a new home in Philadelphia.

Anna tries to save the ring after Abe's cover is blown. Benedict Arnold seeks Washington's help against charges of treason. Townsend sends a signal.

Peggy gets Benedict Arnold to contact the British. Caleb plans an ambush for Simcoe. Anna tries to save Major Hewlett.

Ben is rescued by a mysterious woman. Abe tries to stop Anna from marrying Hewlett. Arnold begins negotiations with the British. Andre betrays Peggy.

Townsend uncovers a British counterfeiting operation. Rogers threatens to destroy Abe's spying ring. Simcoe threatens Richard.

Washington goes to Benedict Arnold's Philadelphia ball. Abe tries to stop Rogers from reaching Townsend. Old friends and enemies collide.

Mary attempts to kill Simcoe by herself. Benedict Arnold defends himself in his court-martial. Ben reunites with his savior.

The Culper Ring is resurrected in time to save Washington's army. Simcoe terrorizes Setauket as he hunts for Rogers. Anna infiltrates New York.

Benedict Arnold plots to give West Point to the British. Andre negotiates for Peggy. Abe plots a revolt in Setauket.

The captured spies on both sides of the war head to the gallows. Benedict Arnold demands glory revenge.

Benedict Arnold rounds up spies in New York. Abe plots to destroy essential British supplies, but he will need his father's help.

When one of the Culper Ring members is captured, Arnold seeks to interrogate him - with the help of a ruthless Colonel Simcoe.

Abe's scheme to rescue Caleb turns deadly. Anna faces a difficult decision. Arnold suspects Peggy is keeping a secret from him.

Amidst a growing rebellion in camp, the Culper Ring must chart a new course. Arnold finds an unlikely ally. Rivington teaches Townsend a lesson.

Seeking revenge against Simcoe, Abe travels to New York and meets Benedict Arnold. A visitor from Anna's past comes to the continental camp.

The plot to kidnap Benedict Arnold is hatched; Peggy learns Cicero's secret; Washington and the French clash over strategy.

Ben's plan to kidnap Benedict Arnold conflicts with Abe's plan to kill Simcoe; changing loyalties turn enemies into allies.

Abe and Simcoe settle their score; Ben appeals to Gen. Washington; Townsend risks everything while Caleb seeks redemption.

Washington heads south to lay siege on Yorktown; Abe volunteers for the Continental Army; Peggy goes into labor.

The fate of the Culper Ring is revealed; the American War of Independence comes to an end; a settling of accounts between shadows and spies; America struggles to begin.