The Secret Ingredient of Grandma's Eclairs

Grandma's eclairs are always incredibly tasty, and also... magical. Just taking a small bite makes people stop frowning, arguing, and complaining. They instantly forget about their illnesses and troubles. Without a doubt, it’s all about the secret ingredient, which is carefully kept in an old tin can, securely locked in a wooden box. Just a tiny pinch – and wonders happen! But one day, after grandson Valentin's birthday, the box went missing. There is a main suspect, but according to the rules of investigation, all guests need to be questioned...