I have read many of the Roy Grace books .The stories are certainly edgy !
I find the TV adaptations a bit strange: the story lines are mangled quite extensively and the casting is bizarre
In the books RG is 5'10" and fair haired whilst John Simm is about 5'5" and greying . Potting is corpulent , with a comb over and constantly making PC incorrect jokes. Bella Moy is constantly at the Maltesers ( barely noticed in the TV series) . Cassian Pewe is a standard sized, sycophantic, whingeing creep in the books whilst Sam Hoare is a towering and intimidating figure