'Jess and the Ghost of Black Rock Castle' is the first story in 'The Jess Mystery Series' for children aged 7 years and older. Jess and her best friend Ruby are going on a school trip to 'Black Rock Castle' with Joe, the twins Lucy and Tom, and the rest of Class Three from 'Oakhill Primary School'. Jess is sure that the castle is haunted by a ghost, but their teacher Mrs Green says that there are only ghosts in stories. Class Three visit the Castle dungeons and the Great Hall. Children go missing, Joe causes trouble and Lucy thinks that she has seen the ghost. There are lots of spooky experiences and Jess and Ruby are frightened and challenged by the ghost in the Ghost Tower. Do they escape and does the ghost really exist?