Blue mystery

"Anegret Benninger who appeared in the author's 'Shooting Star' is back again and this time we are introduced to her home town in Thuringia and to the rest of her family, her botanist father, her mother, a friendly Great Dane, and a household retinue of a gardener, a cook and a young botanical apprentice named Fridolin. The principal event is the disappearance of a blue gloxinia, [Blue Mystery] a special flower of Dr. Benninger's, and the clearance of Fridolin from suspicion." Kirkus