Unknown: Audiobook
Book 4 of the Cal Lovett Files series
According to The Books Insider's catalog data, the Unknown audiobook runs 6.8 hours unabridged, narrated by Russ Bain (about 4.5 hours at 1.5× playback speed).
The instrument When will you finish it?
Based on 6.8 hours of listening.
| Your pace | You'll finish in |
|---|---|
| 30 min / day | 14 days |
| 1 hour / day | 7 days |
| 2 hours / day | 4 days |
| 1 hour / day at 1.5× | 5 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 6.8 hours, it is shorter than 81% of the 6,732 Psychological audiobooks in our catalog.
Catching up on The Cal Lovett Files
This is book 4. Books 1 to 3 run 29 hours before it; books 1 to 4 run 35.8 hours in all.
More narrated by Russ Bain
Russ Bain narrates 27 unabridged audiobooks in our catalog, 212 hours in all.
About as long, on the Psychological shelf
648 Psychological 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
Unknown is book 4 of Heather Critchlow's Cal Lovett Files series: a 6.8-hour unabridged recording, read by Russ Bain, released September 9, 2026, on the Psychological shelf.
The listen at a glance
- Length
- 6.8 hrs
- Narrated by
- Russ Bain
- Released
- September 9, 2026
- Format
- Unabridged audiobook
- Language
- English
- Store shelves
- Psychological
- Series
- The Cal Lovett Files #4
- ISBN
- 9781004237425
How to listen to Unknown 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 Unknown audiobook?
Unknown runs 6.8 hours unabridged. At 1.5× speed that drops to roughly 4.5 hours.
Is the Unknown audiobook free?
Yes, for new listeners: the trial starts you with three free audiobooks.
Who narrates Unknown?
Unknown is narrated by Russ Bain.