This article contains spoilers for the main case Frosty Welcome.
Lewis Flynn is a character in The Sinking City. He is a fisherman from Innsmouth. He lived at the fishermen's house with Will Hammond and a man named Paul.
After learning that he is responsible for the murder of Albert Throgmorton, he can be found hiding at the bar Under the Keel. Charles Reed can either decide that he was not himself, and give him time to flee the city, or denounce him to Robert Throgmorton.