Quaestor Vexatius, Sinusitus, who is about to expose the Roman governor's creative accountancy, has been poisoned. Can Getafix brew an antidote? only if Asterix and Obelix find a certain flower for the druid's potion in Helvetia. What with bank safes, cuckoo hourglasses, yodelling and holes in the cheese, they are soon on a real Helvetian roll.