"We're all keen on yachting in these parts," said my tow-headed friend, Thalia Collingwood. "Father has a yacht, and so has each of his four friends: Colonel Drake; Mr. Nelson; Sir Barnacle Hood; and Dr. Benbow.
"What's more, each of the five has just the one daughter, and each has named his yacht after the daughter of one of the others. So you see (she concluded proudly) "there's a dear little yacht named after me."
Sir Barnacle's yacht is the Gabrielle; Mr. Collingwood owns the Lorna; Mr. Nelson, the Rosalind. The Melissa, owned by Colonel Drake, is named after Sir Barnacle's daughter. Gabrielle's father owns the yacht which is named after Dr. Benbow's daughter.
Who is Lorna's father?

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THE SOLUTION

Clearly Benbows yacht is named Thalia. What is the name of Benbows daughter? Not Gabrielle; for Gabrielles father would then own the Gabrielle. Not Lorna, for Gabrielle would then be Collingwoods daughter. So Benbows daughter is Rosalind; and Nelsons daughter owner of the Rosalind) is Gabrielle. So Lorna is the daughter of Colonel Drake.