Borderline speculative fiction. Wikipedia writes: "Belief in 'magic' features strongly, though the exact nature of this 'magic' is not made clear, and Colin talks of a career in science where he will discover the nature of magic through experiment and will lecture about it. Christian Science, with its belief in God as a life force rather than a person is clearly an influence here, the author being a follower of the movement."
In addition to its stand-alone volume, this title was published in the follow book. It can be rated independently of any volume containing it.