Harrison Lee had fallen in love with Abby Fisher. He had hacked her accounts and learned she did not want to move to Colorado. He had also increased his grandmother's social security payments, accessed pay-for-porn sites, and the MythCrash Gift Card website. Learning of Ivan, he stole the hacker's cyber identity to cover his tracks.
He stole the NSA's Skeleton Key project, accidentally killing Nathan Platt. This was so David Fisher would not move to Colorado.