Books similar like The Case of the Secret Tunnel

Sparklesplash Meets the Mermaids

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Bunnicula: A Rabbit-Tale of Mystery (Bunnicula, #1)

BEWARE THE HARE!
Is he or isn't he a vampire?

Before it's too late, Harold the dog and Chester the cat must find out the truth about the newest pet in the Monroe household -- a suspicious-looking bunn…

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Violet and the Pearl of the Orient

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Violet and the Hidden Treasure

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Violet and the Smugglers

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Violet and the Mummy Mystery

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Violet and the Mystery of Tiger Island

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Premeditated Myrtle (Myrtle Hardcastle Mysteries, #1)

Winner of the Edgar Award!
Finalist for the Agatha Award and Anthony Award!

Twelve-year-old Myrtle Hardcastle has a passion for justice and a Highly Unconventional obsession with criminal science. Armed…

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Dying to Meet You

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Sideways Stories from Wayside School (Wayside School, #1)

There was a terrible mistake - Wayside School was built with one classroom on top of another, thirty stories high (The builder said he was sorry.) Maybe that's why all kinds of funny things happened a…

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The Unseen Guest (The Incorrigible Children of Ashton Place, #3)

Since returning from London, the three Incorrigible children and their plucky governess, Miss Penelope Lumley, have been exceedingly busy. Despite their wolfish upbringing, the children have taken up …

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The Hidden Gallery (The Incorrigible Children of Ashton Place, #2)

Thanks to their plucky governess, Miss Penelope Lumley, Alexander, Beowulf, and Cassiopeia are much more like children than wolf cubs now. They are accustomed to wearing clothes. They hardly ever howl…

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Masterminds (Masterminds, #1)

The first book in the action-packed trilogy from New York Times bestselling author Gordon Korman is perfect for fans of Stranger Things and James Patterson.

Eli Frieden has never left Serenity, New Me…

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The Mysterious Howling (The Incorrigible Children of Ashton Place, #1)

The Incorrigible Children of Ashton Place are no ordinary children, Miss Penelope Lumley is no ordinary governess, and mysteries abound in this first volume in a new series for ages 9+.

Found running w…

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A Pocket Full of Rye (Miss Marple, #6)

A handful of grain is found in the pocket of a murdered businessman!

Let us explain. Rex Fortescue, king of a financial empire, was sipping tea in his 'counting house' office when he suffered a sudden …

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