These are just fun books. As a former professor would call them the Castle books are potato chip books. Not sure who the ghost writer is, but he/she/they include details from Season 2 into the story of Nikki Heat & Jamison Rook. Rook and Heat have parted ways after the publication of his article on Heat. The death of NYC most vicious gossip columnist and Rook's next profile bring Heat & Rook back together.