Alternatively, maybe a new mystery arising where a telegram is found that links back to the original case. For example, a surviving character receives a telegram years later that reopens the investigation or reveals a hidden sin.

The user might be asking for a story that incorporates elements from the movie, but with the inclusion of a telegram. Maybe the killer uses a telegram to communicate with the detectives? Or the detectives receive a clue via telegram? Alternatively, there's a hidden message in a telegram that's key to solving the case.

I need to make sure the story connects to the original movie's elements: the seven sins, the detectives, the killer. The telegram could be a key plot device. Let's structure it with the main characters from the original, maybe Somerset and Mills, who could be investigating a new case or revisiting the past. The telegram could be crucial for the plot progression.