Kelpie is difficult to be sure of. Perhaps he is only driftwood, or a water-horse, or a patch of foam .. Kelpie might be seen out of the corner of your eye or when you least expect it. Some people decide not to notice him .. William Mayne's magical story transforms the ordinary world into a place of mystery and enchantment, where buttercups grow under water and young calves rise out of the water's foam .. whimsical humour and haunting atmosphere.