In previous episodes that are lost to history, there have been murders in cabin 15 on a cruise ship. Is it haunted? Is there something else behind the deaths? That is the mystery that brings Charlie Chan to the scene. He is to spend the night in the suspicious cabin, but due to a mix up, someone else does, and is killed.
Join Charlie Chan as he gathers the explosion of clues from crew members and passengers. Can he believe everything he is told? Who can be trusted? As is the nature of radio serials, the answer comes in a following episode, but who do you think it might be? What natural explanation would answer for the seemingly supernatural events?