Reviewed by HootRated editorial · Last updated
Dark Day in the Deep Sea
Mary Pope Osborne
Magic Tree House; Stepping Stone; Magic Tree House: Merlin Missions
The text is written at a 3rd grade reading level, the subject matter is intended for younger children (ages 5–8), and the content is gentle with no concerning themes. Its HootRating code, C, means gentle content.
We may earn a commission from these links.
About This Book
Jack and Annie travel back in time to sail on the famous H.M.S. Challenger, where they dive into exciting ocean adventures and uncover the truth behind a legendary sea monster. Along the way, they discover fascinating sea creatures and learn the importance of kindness to all living things. Their journey beneath the waves is full of wonder and surprises!
Themes
Quick Assessment
This is a Level 3-4 book with gentle content intensity. No notable content concerns flagged. Written for readers ages 5-8.
Why we rated Dark Day in the Deep Sea C (Gentle)
Dark Day in the Deep Sea is written at a Level 3-4 reading level across 106 pages (approximately 11,676 words). Reading-wise, most kids in grade 5 and up can manage Dark Day in the Deep Sea on their own; younger readers can enjoy it with a parent or teacher reading along.
Read aloud, Dark Day in the Deep Sea runs about 1.3 hours — long enough to span several bedtime sessions.
We rate Dark Day in the Deep Sea as C (Gentle) because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.
No specific content flags were raised by community reviewers, which is consistent with the gentle intensity score.
Thematically, Dark Day in the Deep Sea explores adventure, science & nature, time travel, compassion, and historical — these threads give the book room to mean different things to different readers.
Good fit for
- ✓ Children in the Ages 5-8 range — the maturity and attention span match the story's pacing.
- ✓ Readers who like a steady plot with enough momentum to keep pages turning.
- ✓ Kids drawn to stories about adventure, science & nature, time travel.
- ✓ Readers who fall hard for one book and want a long series to live in — there is one more book in the Magic Tree House; Stepping Stone; Magic Tree House: Merlin Missions series.
Maybe not for
- ! Readers looking for something heavier — this is a gentle, low-stakes story by design.
For Parents
Content Intensity
C · GentleReading the HootRating code: the first letter is the content intensity (C = Gentle · L = Mild · M = Moderate · I = Intense · V = Very Intense); the second, when there is one, is the kind of content that drives it (E = Emotional · P = Physical · S = Social · T = Thematic). Reading level and age range are rated separately. How we rate
No conflict beyond everyday childhood experiences. Safe for sensitive readers.
Was our "Gentle" content intensity rating accurate for this book?
Reading Insights
Hook Factor
6/10Engaging read with solid pacing and interesting themes.
Discussion Potential
1/10A lighter read — great for independent enjoyment.
Book DNA
Multi-dimensional content fingerprint
More in the Magic Tree House; Stepping Stone; Magic Tree House: Merlin Missions Series
If your child liked this book, they might like these
Matched on content and themes — all rated for reading level and content intensity.
The voyage of the Dawn Treader
C. S. Lewis
The voyage of the Dawn Treader
C. S. Lewis
Haunted castle on Hallows Eve
Mary Pope Osborne
Haunted castle on Hallows Eve
Mary Pope Osborne
Revolutionary War on Wednesday
Mary Pope Osborne
Revolutionary War on Wednesday
Mary Pope Osborne
The Mystery of the Hidden Beach
Gertrude Chandler Warner
The Mystery of the Hidden Beach
Gertrude Chandler Warner
The Magic Half
Annie Barrows
The Magic Half
Annie Barrows
Island of Dragons
Lisa McMann
Island of Dragons
Lisa McMann
Deep Trouble
R. L. Stine
Deep Trouble
R. L. Stine
Dark Life
Kat Falls
Dark Life
Kat Falls
Details
Book Length
- ISBN
- 9780375837319
- Pages
- 106
- Publisher
- Random House Books for Young Readers
- Published
- 2008
- Type
- Fiction
- Word Count
- 11,676
- Read-Aloud
- ~1h 18m
- Text Density
- Light Text