Description from the publisher:
In Tower of London, players fight for control of the tower using their influence to occupy different buildings and gather ravens. Each turn, players play two cards: the first card determines which building their Beefeater (guard) goes into, and the second card has a special power that triggers from the perspective of the Beefeater just placed.
At the end of a round, certain areas of the tower are scored based on who controls the majority of buildings by having the most Beefeaters in each. The game ends at the end of three rounds or when a player collects seven ravens, in which case the game ends immediately.