The Knight by Steven James

A psychotic killer is on a roll and Agent Patrick Bowers is hot on the trail, he thinks. Thanks to step-daughter Tessa and her Rubik's cube, Patrick gets help leading to the identity of the madman. Time is running out and Patrick finds himself the murderer's victim. Will he be able to overcome this villain? Is Tessa ready to search for her birth father? Does the clever murderer have inside information? A good read.