The next morning, Dr. Rivers arrives at the hospital to check on his patients. He finds that one of the patients is dead, and the other is suffering from a severe headache. He tells Rivers that the patient's body was found in the back of the car, and that the other patient was found unconscious in the front seat. Rivers then goes to examine the patients' bodies. He discovers that the patients had both been hit by a hammer and had both died instantly. Rivers realizes that the