They say publishers love novels that turn into a series. The characters in these collections of stories develop their own fan base assuring the publisher of a a steady and increasing audience to gobble up each new adventure as soon as it hits the stands. Still, it’s tricky to write that kind of series because each book has to serve two plots. Each book has a primary, short plot: it finds and resolves a conflict that involves the new characters and most (if not all) of the permanent cast. The second plot is harder because it’s part of the overall arc of the series. This plot creates some incremental change in the lives of the permanent cast and lets them create or resolve underlying conflicts (Continuing characters must evolve from book to book or the reading public gets bored and leaves). Interweaving these two plots in each book is a little like jumping rope double-dutch style: it takes skill, balance and concentration. Thriller/Mystery novelist Val McDermid has created three different detective novel serials, the most popular of which are the Tony Hill/Carol Jordan books. Her latest in this series, Splinter the Silence, shows how a good author can make some…