Fafhrd and the Gray Mouser are hired to escort the beautiful and elusive daughter of a merchant on a dangerous journey by sea. The trip is something of a rugged nature... The two adventurers' loving advances are frustrated repeatedly, they encounter a sea dragon endowed with a fine sense of smell, and they go through much more dangerous situations than anticipated. Between one thing and another, rats, many rats, a real invasion of rats that can reach diabolic dimensions, and an amazing journey through another Lankhmar within Lankhmar.