検索キーワード： "Mildred A Wirt" 社会科学

When a bridge is sabotaged, Penny Parker suspects foul play. With help from her quirky allies, she dives into a thrilling mystery that involves danger and clever sleuthing.

Behind the Green Door follows teen detective Penny Parker as she investigates a mystery at a ski resort. A reclusive old man keeps his granddaughter imprisoned in a remote cabin, and suspicious figures lurk around the lodge. Penny’s fearless sleuthing leads her straight into danger.

The Missing Formula is a thrilling young-adult mystery about orphan Anne Fairaday, who must uncover her father’s missing scientific formula before it falls into the wrong hands. With the help of her brave friend Madge Sterling, she embarks on a race against time filled with danger and deception.

In Swamp Island, teen detective Penny Parker finds herself in the middle of a mystery involving an escaped embezzler, a vengeful criminal, and a missing fortune. As she navigates through danger and deception, Penny must use her sharp instincts to crack the case. A thrilling, fast-paced entry in the Penny Parker mystery series!

Over a school holiday, young Penny persuades her father to let her work as a junior reporter at the local newspaper, the Riverview Star. Battling workplace rivalry and navigating the world of journalism becomes even more challenging when she lands her first major assignment - investigating an explosion at the Conway Steel Plant. As she aids a struggling colleague, she stumbles upon a fraudulent plot to sell a counterfeit explosive device. In a thrilling climax, Penny unveils the scam, bringing the perpetrators to justice!