The Mystery of the Hidden Painting (Volume 24) (The Boxcar Children Mysteries)

The Aldens find a mysterious painting hidden in the attic. The children learn that it is a portrait of their grandmother, whom they never knew, wearing the necklace Grandfather gave her when they were married. The necklace disappeared on their first anniversary — and was never found. Can the Boxcar Children track down a necklace missing for so many years?