'Being endowed by his Creator,' said Father Brown with a smile, 'with the right to life, liberty, and the pursuit of motoring—not to mention aviation. So I suppose we may take it that one strange aeroplane passing over that house, at certain times, wouldn't be noticed much.'
'No,' replied the young man; 'I don't suppose it would.'
'Or even if the man were known,' went on the other, 'I suppose he might get hold of a machine that wouldn't be recognized as his. If you, for instance, flew in the ordinary way, Mr. Merton and his friends might recognize the rig-out, perhaps; but you might pass pretty near that window on a different pattern of plane, or whatever you call it; near enough for practical purposes.'
'Well, yes,' began the young man, almost automatically, and then ceased, and remain
