Natural Causes

Vincent is a professional suicide merchant. He has been summoned by Walter Bryce and mistakenly assumes that his potion is for Walter''s consumption. Eventually it becomes clear that Walter''s wife Celia is the client or is she? Why are her suicide letters typed and unsigned? Several attempts to do away with various characters result in multiple poisonings of a rubber plant. Will anyone actually drink the potion?2 women, 3 men