Blythe Girls: Margy's Queer Inheritance, The by Laura Lee Hope

Helen, Margy and Rose Blythe, displaced from their family home in Long Island, have struggled to carve out a new life in their tiny apartment in New York City. But it is still hard to make ends meet. When Margy discovers she is to receive an inheritance from an aunt she hardly knew in the Midwest, the sisters are excited. Excitement turns to chagrin when they find that the inheritance appears to be an old clock, a battered living room set, and a huge box of flour. But there’s more there than meets the eye —if the girls can solve their eccentric aunt’s clues to a real-life treasure hunt. - Summary by Cheryl Adam

Laura Lee Hope is a pseudonym used by the Stratemeyer Syndicate for the Bobbsey Twins and several other series of children's novels.