@OumniaEk The most useful thing I do to keep my plots coherent: track character motivation. Each character (protag, antag, and undecided) wants something. Each acts to advance that agenda. As long as I know who wants what, and what they are doing to attain it, the plot takes care of itself
I just got this lovely framed copy from my publisher, Thomas & Mercer to commemorate over 100,000 copies sold of "A Killer's Mind" !
Thanks so much, T&M! And thanks to all my readers, who made this amazing moment possible