This volume assembled 15 complete novels by Mildred A. Wirt (writing as Mildred Benson). A rival to the Nancy Drew series (and created by one of the primary Nancy Drew writers), Penny is a plucky girl reporter whose nose for trouble always leads to a new mystery.

• The Second Girl Detective Megapack: 23 Classic Mystery Novels for Girls
• The Anna Katharine Green Mystery Megapack: 35 Classic Mystery Novels & Stories
• The Girl Detective Megapack: 25 Classic Mystery Novels for Girls
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• The Carolyn Wells Mystery Megapack: 17 Classic Mysteries with Pennington Wise, Fleming Stone, & More!