On having further autopsy, Frank found out a gelsemium weed plant. This plant is found in North and it's deadly once in contact. It can cause paralysis . Frank was quite disturbed after having seen these things.
During their activities, the radio kept on changing it's station. The most striking part it kept on stopping at a particular song before changing...
"Open up your heart,
let the sunshine in".
Frank felt something wasn't right so he suggested his son not to continue the operation but his son didn't hear his father's warning.