Mary Maloney made sure to cover her tracks in "Lamb to the Slaughter," ensuring that the police could not implicate her in Patrick's murder. You are now detectives who must discuss elements that lead to a "perfect murder."  Draft a list of perfect-murder ingredients and put the elements in order of importance. Elements may include the following: the murderer would try to  leave no clues for police to find, the murderer would make sure there's no noise, the murder would look like an accident and the murderer would have a strong alibi.