The duchy of Velen is a bastion of law and order in an otherwise untamed land. Its ruler, Duke Calchais, holds his citizens and visitors to his city to a high standard of conduct. When Velen's harbormaster is murdered, the duke enlists the aid of adventurers to see that justice is served. Was the harbormaster a victim of larceny gone awry, or is something more sinister afoot in Velen? Murder in Velen is a 4-hour standalone adventure set in and around the port city of Velen, which is located in the peninsula nation of the same name in southwestern Faerûn. Velen is designed for a party of five 10th-level player characters, but it can easily be scaled by adding or removing creatures.