The Hidden Window Mystery is the thirty-fourth volume in the Nancy Drew Mystery Stories series. It was first published in 1956 under the pseudonym Carolyn Keene. The actual author was ghostwriter Harriet Stratemeyer Adams.

Summary (original edition)

The Hidden Window Mystery takes Nancy Drew on a captivating adventure filled with architectural secrets, family legacies, and a puzzling disappearance.

The story unfolds when Nancy is invited to the historic old mansion of the Chapley family, where rumors swirl about a mysterious hidden window mentioned in old family documents. The current residents, elderly Miss Rosemary and her niece Holly, are convinced that the legendary window holds the key to locating a missing family heirloom—a priceless stained glass masterpiece. However, their efforts to find it are thwarted by a series of strange occurrences: eerie lights appearing in the garden at night, unexplained footsteps in empty hallways, and the sudden disappearance of Holly under suspicious circumstances.

Nancy’s investigation leads her through a maze of architectural clues hidden in the mansion’s design—from secret compartments in antique furniture to coded messages in the house’s stained glass windows. As she digs deeper, she uncovers a connection to a long-lost relative who vanished years ago under mysterious conditions. The danger escalates when Nancy realizes someone is determined to keep the window’s secret hidden at any cost, resulting in a harrowing encounter where she is nearly trapped in a collapsing secret passage.

The novel stands out for its atmospheric Gothic elements, blending classic mystery tropes with architectural puzzle-solving. Nancy’s deductive skills shine as she interprets historical clues while navigating very real present-day dangers. The 1956 original edition features more intense peril and richer historical detail than later revisions, maintaining the series’ signature blend of suspense and clever detective work.

Nancy Drew #34 –The Hidden Window Mystery First Edition Book Identification Guide

Only the first few printings of the first/second year are shown. Printings codes are based on the Farrah Guide, 12th printing. Please refer to the guide for later printings.

Nancy Drew #34 –The Hidden Window Mystery First Edition Dust Jacket Identification Guide

Reference:

• Farah’s Guide to Nancy Drew, 12th printing