Writing a story

As a part of my project I have to tell a story. For this I need a storyline.

I looked online at various websites and personal accounts on how to write a good/passable story. My piece of fiction would be based at Radcliffe Tower as it was during the war of the roses.

Whilst the war of the roses was on, the manor part of the tower and the tower itself where both standing. I wanted to use small facts like this to make my story seem more believable. But I also wanted to create completely fictitious characters. So that I could tailor the plot to include exactly what I wanted.