Again an animal mystery set in New Jersey shows Mr. Robertson as an efficient creator of setting and plot, this time a plot involving family relationships. For a summer job, young John Michelson is referred by a neighbor, Professor Danville, to widowed Mrs. Atkinson, a scientist illustrator who has come to the country to do a book on ferns and mushrooms. John takes on the work of guiding her and ""baby sitting"" for her ten year old daughter Billy. But all their lives are charged with mystery by the appearance of a spotted buck, a marvellous creature evidentally being hunted by a local hermit, One Ear Pete, who on gradual acquaintance proves friendly. His secret, when revealed, is that he is Mrs. Atkinson's father-in-law, through a marriage that was disapproved of by her husband's snobbish family, and now a painter of nature subjects with considerable personal talent. Well worked.