To solve this mystery Marlow Phillips, Girl Detective, must be able to provide, Motive, Opportunity, Means. She has a room full of people that all hated Gregory Kent for the lies he told about them on his late night radio program. So they all had a motive. They were all having lunch at the restaurant at the time Gregory Kent was murdered. So they all had the Opportunity. The one ingredient missing from the recipe is the Means, Gregory Kent died fifteen minutes after the last of Marlow's suspects left the restaurant.