everything. investigators questioned if the attack was part of some bigger plot, and raced to unlock the mystery before the color could strike again. here is "the grudge". summer, 2020. in the throes of a pandemic, a killer had devised the perfect plan for murder. >> our guard was down. because that bell was ringing so often. >> home deliveries had become a way of life. >> some of these packages were being delivered by people out of their own cars. >> so, there was no cause for alarm went on a lazy sunday afternoon, a man rang the doorbell at the home of a prominent family in north brunswick, new jersey. >> and i remember my son looking at me i'm going, who is that? >> they had no idea, ivan was waiting on the other side. >> i saw my son lying perpendicular to the door, holding his chest. and then i remember just