The Pea Soup Poisonings — Nancy Means Wright

To get into her brother's Northern Spy Club, Zoe Elwood must walk a narrow beam over rusted farm machinery, and then solve a crime. Her chance comes when Alice's grandmother expires after eating a bowl of pea soup. Kelby gives Zoe just five days to solve the crime. Can she do it? (ages 9-12) Winner of an Agatha award for Best Children's/Young Adult Novel. Children's/Young Adult Mystery by Nancy Means Wright; originally published by Hilliard and Harris