Lovemurder by Saul Black

An eerie murder mystery that involves a woman who is incarcerated and the detective who put her there. When the strange note and new murder happens, Valerie has no choice but to contact Katherine to get her help in tracking down the other half of a murderous pair. What is Katherine's motive in helping Valerie catch her old partner and will Valerie survive being pulled back into their twisted games? For fans of twisty plots and evil characters ala Hannibal Lector or Blacklist.