Wonderful news!  Congratulations.  I've only just discovered Nic Costa and am reading the first book.  Do you think you will have any say in the matter of casting?  I've never had a whole book televised (let alone a series!) but when a short scene from one of my early books was used in a documentary I had no say whatsoever and it kept me awake at night agonizing over their choice of hero.  He simply wasn't how I'd created him.  A more cynical novelist friend told me to be grateful for the money and let it go!
Benita Brown