The Light in the Cellar (American Girl Mysteries (Quality))

Molly wishes that she and her English friend, Emily, had exciting volunteer jobs that really helped in the fight to win World War Two. Instead, they're magazine delivery girls at Oak Knoll Hospital. Soon, however, Molly and Emily start to suspect that something very un-patriotic is going on at Oak Knoll--and their snooping leads them into deep trouble! Girls will enjoy solving the mystery right along with Molly and Emily.