The Books Insiderindependent audiobook data
The Secret Kingdom by Allen S. Kline, Otis Adelbert Kline

The Secret Kingdom: Audiobook

According to The Books Insider's catalog data, The Secret Kingdom runs 5.7 hours as an unabridged audiobook, narrated by John Mclain (about 3.8 hours at 1.5× playback speed).

5.7listening hrs
Science Fictionstore shelf
2020released
Free for new listeners

The instrument When will you finish it?

Based on 5.7 hours of listening.

Days to finish The Secret Kingdom at common listening paces
Your paceYou'll finish in
30 min / day12 days
1 hour / day6 days
2 hours / day3 days
1 hour / day at 1.5×4 days

Part of The Audiobook Finish-Time Calculator: the same instrument for any audiobook we measure.

What our data says

  • At 5.7 hours, it is shorter than 73% of the 13,269 Science Fiction audiobooks in our catalog.

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

The Secret Kingdom is an audiobook by Allen S. Kline and Otis Adelbert Kline: a 5.7-hour unabridged recording, read by John Mclain, released June 23, 2020, on the Science Fiction shelf.

The listen at a glance

Length
5.7 hrs
Narrated by
John Mclain
Released
June 23, 2020
Format
Unabridged audiobook
Language
English
Store shelves
Science Fiction
ISBN
9781645551126

How to listen to The Secret Kingdom 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 free

Questions listeners ask

How long is The Secret Kingdom as an audiobook?

The Secret Kingdom runs 5.7 hours unabridged. At 1.5× speed that drops to roughly 3.8 hours.

Is The Secret Kingdom free as an audiobook?

Yes, for new listeners: the trial starts you with three free audiobooks.

Who narrates The Secret Kingdom?

The Secret Kingdom is narrated by John Mclain.