Why do the kidnappers kill the dog walker? Does the dog walker's identity have anything to do with his death? How does the dog walker's identity make things more difficult for Mitch? How does killing the dog walker have a bigger impact than simply killing the dog would have? Would killing the dog only have convinced Mitch as well as killing the dog walker did?

Why do the kidnappers leave Holly's blood all over the kitchen? Why does Mitch not attempt to clean up the kitchen? What would have happened had Mitch attempted to clean the kitchen? Why does Mitch not attempt to find the evidence the kidnappers claim to have buried?

Why does Mitch search the garage? What did Mitch expect to find? What does he find? What does the discovery of the equipment prove? What does the equipment say about the kidnappers...