Available at MysteryNet.com
On Christmas Eve, San Francisco PI Sharon McCone searches for her nephew Mike, who ran away from his Pacific Palisades home seemingly because his mother wouldn't give him a moped for Christmas.
As her search moves into the the seedier parts of the city, Sharon fears Mike may have gotten caught up in sex or drugs. She is forced to admit her mental picture of Mike is badly outdated. McCone's background as part of a large family makes her an excellent character through whom readers can feel sisterly concern and the difficult realization that the boy she remembers has grown.