All of his novels were so fast-paced that the reader was compelled to turn the pages in a non-stop effort to reach the end of the book. The final page often produced a totally unexpected plot twist that would invariably leave even his most die-hard fans surprised. His early books contained some violence that matched the era in which they were written, though this was considerably toned down as plots centred more on circumstantial situations to create the high degree of tension that was the hallmark of his writing. Sex was never explicit and, though often hinted at, seldom happened.