Sisters In Cold Blood by Kay A. Oliver
Keri Shaw, a middle-aged Nancy Drew, inherits her uncle’s house. There she discovers a confession letter dated 1909 written by a serial killer who is already dead and was never charged with a single crime. The letter holds clues to where the bodies may be buried but they need to figure out this puzzle first by follow the twisted path laid out by a ruthless killer years before.
Thinking that law enforcement will not bother to investigate the case, Keri begins her own investigation. What Keri and her husband, Jade, did not account for was Detective Alison Valencia, their serial killer friendship to an infamous killer or the shadowy figure stalking their every move.
Will they finish their quest or become the serial killers last prey?