What You Do Not Know: Audiobook
Book 18 of the Maria Wern series
According to The Books Insider's catalog data, the What You Do Not Know audiobook runs 10.3 hours unabridged, narrated by Sofia Engstrand (about 6.9 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 10.3 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 21 days |
| 1 hour / day | 11 days |
| 2 hours / day | 6 days |
| 1 hour / day at 1.5× | 7 days |
You'll finish in – by –
Part of The Audiobook Finish-Time Calculator: the same instrument for any audiobook we measure.
What our data says
- At 10.3 hours, it runs longer than 76% of the 22,296 Police & Detective audiobooks in our catalog.
Catching up on Maria Wern
This is book 18. Books 1 to 17 run 188.9 hours before it; books 1 to 22 run 243.7 hours in all.
| Book | Title | Length |
|---|---|---|
| 1 | The Speechless God | 8.8 hrs |
| 2 | All the Tranquil Dead | 11.3 hrs |
| 3 | May Death Sleep | 10.7 hrs |
| 4 | The Silver Crown | 10.8 hrs |
| 5 | Dreams from Snow | 11.9 hrs |
| 6 | Black Butterfly | 13.2 hrs |
| 7 | Strange Bird | 11.6 hrs |
| 8 | Boy Missing | 12.4 hrs |
| 9 | Not even the past | 11.9 hrs |
| 10 | Not Until the Giver is Dead | 11.9 hrs |
| 11 | Killer's Island | 12 hrs |
| 12 | The Eternal Flame of Alchemy | 11.2 hrs |
More narrated by Sofia Engstrand
Sofia Engstrand narrates 125 unabridged audiobooks in our catalog, 1,326 hours in all.
About as long, on the Police & Detective shelf
5,106 Police & Detective audiobooks in our catalog run within 10% of this length. The most popular on the store:
Computed from 409,794 English-language unabridged audiobooks in The Books Insider catalog (store data read November 3, 2026). Lengths are the store's own running times. Methodology.
About this listen
What You Do Not Know is book 18 of Anna Jansson's Maria Wern series: a 10.3-hour unabridged recording, read by Sofia Engstrand, released November 3, 2025, on the Police & Detective shelf.
The listen at a glance
- Length
- 10.3 hrs
- Narrated by
- Sofia Engstrand
- Released
- November 3, 2025
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Police & Detective
- Series
- Maria Wern #18
- ISBN
- 9789180440158
How to listen to What You Do Not Know free
New members at audiobooks.com get three free audiobooks with the trial.
Separately, the store's catalog carries more than 10,000 audiobooks that are always free to stream.
Start listening freeQuestions listeners ask
How long is the What You Do Not Know audiobook?
What You Do Not Know runs 10.3 hours unabridged. At 1.5× speed that drops to roughly 6.9 hours.
Is the What You Do Not Know audiobook free?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates What You Do Not Know?
What You Do Not Know is narrated by Sofia Engstrand.
Is What You Do Not Know worth listening to at 1.5× speed?
At 1.5× you'd finish in about 6.9 hours, saving 3.4 hours.