I'm not sure specifically as I haven't read it in detail. But generally, it might involve a story full of mystery, perhaps with a central character facing some kind of past trauma or a series of events that are unforgettable.
Since I haven't actually read this 'unforgotten night the series novel', it's difficult to say precisely. However, it may be a story that uses the night as a backdrop to tell a tale of relationships, perhaps between different characters. The night could symbolize a time when secrets are revealed, emotions are heightened, and the plot takes on a different tone compared to the day - for example, it could be a time of danger or a time for deep, heartfelt conversations. There could also be elements of the supernatural if it's that kind of series, with the night bringing out strange happenings.
Unforgotten is purely fictional. It's not based on any actual events or people. The show's creators came up with the story and its developments to captivate the audience.
Maybe there's an old hermit - like character who has some knowledge about the ghost in the story. And of course, there's likely to be the ghost itself, which could be the spirit of a wronged person from the past, seeking revenge or just trying to tell its story.
The brave knights are also quite popular. They are usually depicted as fearless warriors, ready to defend the unforgotten realms against any threats. They might go on epic battles against fearsome monsters or evil sorcerers.