" Nobody ever explains. Yes, “Secretaries I have had.” No. 1, a murderer fleeing from justice. No. 2, a secret drinker who carries on disreputable intrigues in Italy. No. 3, a beautiful girl who possesses the useful faculty of being in two places at once. No. 4, Miss Pettigrew, who, I have no doubt, is really a particularly dangerous crook in disguise! "

― Agatha Christie , The Man in the Brown Suit (Colonel Race #1)