This cake reflects the enigmatic nature of Mrs. Garrick, whose true situation is slowly revealed as the plot unfolds.
Preheat oven to 350°F.
In a mixing bowl, combine flour, sugar, cocoa powder, and baking powder.
Add melted butter, eggs, and vanilla. Mix well.
Pour batter into a greased baking pan.
Bake for 25 minutes or until a toothpick comes out clean.
Cool before serving.