Was the little girl, who appears to have been everybody's darling, kidnapped for money? Nobody comes forward asking for a ransom. Did she sneak down to the river and drown? In „The Millionaire Baby", a young detective Mr. Trevitt has more than one reason for desperately wanting to solve the mysterious case of little Gwendolen, a millionaire's daughter who missed since the afternoon of August the 16th from right under the nose of her nurse. Our detective soon meets the widow living next door, a close friend of the bereft mother. Something does not quite add up with neither mother nor neighbor – but then there are several other characters offering clues. Or are they red herrings?