Penny Nichols and the Mystery of the Lost Key

"Penny Nichols and the Mystery of the Lost Key" by Joan Clark is a captivating mystery where a smart and daring young girl named Penny Nichols gets caught up in an exciting adventure. After witnessing a jewelry theft in a department store, Penny meets Rosanna Winters, who has just inherited a large estate. Losing an important letter and key that explains how this inheritance works is a problem, with Penny and her friend Susan racing towards a jewelry counter, Penny sees a man steal a diamond ring, which then connects her with Rosanna. Offering to take Rosanna to meet a lawyer, Penny soon learns that many people want the estate for themselves, each with their own secrets, adding to the suspense as Penny uses her quick thinking to solve the mystery.