The author, who has ME/CFS, sent me the following link to highlight his new book where one of the main characters has ME/CFS and fibromyalgia.
I don't know anything more.
A few reviews are up on the link given in the tweet.
THE EMBLETON MURDERS After ten years of working at Embleton University, Professor Robbie Mustoe is ordered to take a sabbatical by senior management. Within days of his sabbatical starting, two of his trusted lecturing staff are suspended and eventually leave the university under a veil of secrecy. Months later, two staff members involved in the removal of his trusted colleagues from the university, die in separate incidents. Professor Mustoe suspects foul play and turns to his friend since school days, DCI Parrish. DCI Parrish had to take early retirement from the Metropolitan Police on health grounds. Diagnosed with ME/CFS and fibromyalgia, symptoms including chronic fatigue and pain prevented him doing his job properly. But it was brain fog; poor concentration, memory problems, difficulty speaking and counting, that ended his career. After talking with Robbie, Parrish begins researching the mysterious deaths. He feels the excitement of being involved in a case again. But is it a case? It is when a third member of the university goes missing. A DCI PARRISH Crime Thriller by Bear Lawrence Available exclusively on Amazon
Edited to add: I did try to add the Amazon link in the post here but it wouldn't load