Amongst my novels, I have completed two trilogies and one five-book series. I am now working on the second of my WW1 novels. I find that writing the first book is relatively straightforward because I will create new characters specifically to fit that first plot. The third book is also relatively straightforward because I now know those characters inside out. I can readily design the plot to suit them. Book two is the most demanding one. I must ensure continuity of character with the first book. I must also design a plot to fit characters who have surfaced only in one book. I wonder if other novelists have that problem. I haven’t seen it discussed elsewhere. It means this second WW1 story may well take a little longer than the five or six months I usually need to complete a novel.