Spoiler Alert - HUGE question about ending!
In the finale, the killer is very surprised and upset to learn they found the body of his father who he murdered. But, this begs the question, WHY did he leave his father's heart on the beach? And why did he leave the blood DNA of his father in the bag with the brain remains if he never wanted his father to be found, thus the reason he hid him in the loch.
Any thoughts or ideas???