Everyone In My Family Has Killed Someone

Do you promise that your detectives shall well and truly detect the crimes presented to them using those wits which it may please you to bestow upon them and not placing reliance on nor making use of Divine Revelation, Feminine Intuition, Mumbo Jumbo, Jiggery-Pokery, Coincidence, or Act of God?

Membership oath of the Detection Club, 1930, a secret society of mystery writers including Agatha Christie, GK Chesterton, Ronald Knox, and Dorothy L Sayers.