"Red Seas Under Red Skies" is the second book in the Gentleman Bastard series by author Scott Lynch. It follows the adventures of the main character, Locke Lamora, and his friend Jean, as they navigate the treacherous world of piracy and deception in the city of Tal Varran. The story explores themes of friendship, loyalty, and survival, as Locke and Jean face various challenges, including betrayal and the pursuit of a powerful enemy. The novel combines elements of fantasy and heist, showcasing Lynch's signature wit and intricate world-building.