Complete story — includes the ending
Queen Mary allies with Gideon against Elizabeth; together they fool Elizabeth's spies by making it appear that Gideon has seduced Mary, thus securing the release of Gideon's daughter, Agatha. However, Gideon has developed real feelings for Mary. Claude is married to Duke Boinel, who hits her on their wedding night, but she hits him back and runs away.
Angered by what happened to Princess Claude, Prince Charles forces the Privy Council to remove Lord Narcisse as regent and appoint Queen Catherine instead. Unbeknownst to them, Queen Catherine had secretly bribed Duke Boinel to strike Claude, setting those events in motion. Princess Claude's marriage is annulled, and Leith promises to rise in station until he is worthy of marrying her. Lady Lola arrives at English court and learns that Queen Elizabeth has no intention of releasing her family. Queen Elizabeth is poisoned and miscarries her baby. Martin returns to France and learns that Greer is pregnant with his illegitimate child, and that she's planning to give it away to her married sister, Lady Ellen (Lyla Porter-Follows).
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Reign season 3. HTML formatting and reference markers removed. · Content license