Henry Gamadge, bibliophile and amateur detective, travels to Maine to help investigate a series of poisonings, which at first seem to be accidental.

New York bibliophile and sleuth Henry Gamadge is charming, genteel and dashing, and has earned himself quite a reputation in detection. So when his friend, State Detective Mitchell, asks for his help on a case involving several young children poisoned with deadly nightshade, some of them fatally, Gamadge is on the next train to Maine. At first it seems open and shut - a gypsy child traded the attractive berries for playthings - but when Gamadge digs deep, he learns that there's nothing childish about the deadly games being played out.