Richard III, Part 2: The Boar Hunt

Nothing now can check Gloucester's devious and ruthless struggle to possess himself of the Crown. His brothers are dead, the Queen's party has been destroyed, and Richard, in his new guise as Lord Protector, has seized his two young nephews, Edward V and his small brother Richard of York, and imprisoned them in the Tower. (Covers Richard III Act 3 S1—conclusion)