The Philanderers by A.E.W. Mason

Hugh Fielding, while speculating upon certain obscure episodes in the history of a life otherwise familiar to an applauding public, and at a loss to understand them, caught eagerly at a simile. Now Fielding came second to none in his scorn for the simile as an explanation, possibly because he was so well acquainted with its convenience. 'A fairy lamp' he would describe it, quite conscious of the irony in his method of description, 'effective as an ornament upon a table-cloth, but a poor light to eat your dinner by.'

Nevertheless Fielding hugged this particular simile, applying it as a sort of skeleton key to the problem of Stephen Drake's career.