As far as the police characters are concerned, I already know them well from the first book,

BOOK

Murder by Numbers   (18+) The first Rebecca Brookes novel #2221825 by Bookcase

It is the new characters that I have to get to know.

I am pretty well up on the villain, but writing children is, I think, the hard part. It is so long since I was a child, or even had children around. And, like with my first book, police have lives outside of the job and that has to be shown.