Lieutenant Frank Kerrigan of the New York City Police does a good turn for Detective Jane Boardman by co-sleuthing on an inherited eleven-year-old kidnapping case. A clutch of envelopes from the kidnapper, addressed to the family of a missing seven-year-old girl, is the starting point for a painstaking search for a gentle, elderly pervert. Interviews, a break and capture, and Jane is promoted. Jane and Frank--primary grade.