Threshold cover art

Threshold

Boundary, Book 2

Preview
Get this deal Try Premium Plus free
Offer ends 29 January 2026 at 11:59PM GMT.
Prime members: New to Audible? Get 2 free audiobooks during trial.
Just £0.99/mo for your first 3 months of Audible.
1 bestseller or new release per month—yours to keep.
Listen all you want to thousands of included audiobooks, podcasts, and Originals.
Auto-renews at £8.99/mo after 3 months. Cancel monthly.
Pick 1 audiobook a month from our unmatched collection - including bestsellers and new releases.
Listen all you want to thousands of included audiobooks, Originals, celeb exclusives, and podcasts.
Access exclusive sales and deals.
£8.99/month after 30 days. Renews automatically.

Threshold

By: Eric Flint, Ryk E. Spoor
Narrated by: Jonathan Walker
Get this deal Try Premium Plus free

£8.99/mo after 3 months. Cancel monthly. Offer ends 29 January 2026 at 11:59PM GMT.

£8.99/month after 30 days. Renews automatically. See here for eligibility.

Buy Now for £18.99

Buy Now for £18.99

LIMITED TIME OFFER | £0.99/mo for the first 3 months

Premium Plus auto-renews at £8.99/mo after 3 months. Terms apply.

About this listen

When the strange fossil she'd discovered ended up giving her a trip to Mars, Helen Sutter thought she'd gone about as far as any paleontologist would ever go in her lifetime. But when you've also married A.J. Baker, overconfident super-sensor expert for the only private agency in space (the Ares Corporation), and your best friend Madeline Fathom Buckley is a former secret agent who's just signed on as the chief of security for the newly created and already embattled Interplanetary Research Institute of the United Nations, there's always somewhere farther to go.

The newest discoveries will take her, A.J., and their friends Jackie, Joe, and Madeline to the mysterious asteroid Ceres and beyond, in a desperate race to Jupiter's perilous miniature system of radiation-bombarded moons. The next gold rush is on - for alien technology, hidden in lost bases around the system. And there are people willing to do anything to get it - even plan the first interplanetary war, 400 million miles from home!

©2010 Eric Flint and Ryk Spoor (P)2014 Audible Inc.
Science Fiction Space Opera Fiction Solar System Natural History Paleontology

Listeners also enjoyed...

Boundary cover art
Cascade Point cover art
The Eden Plague cover art
The Last Valkyrie cover art
Heirs of Empire cover art
Boneyard Dog Omnibus cover art
The Merrimack Event cover art
The Belt: The Complete Trilogy cover art
Columbus Day cover art
We Are Legion (We Are Bob) cover art
Jurassic Park cover art
The Singularity Trap cover art
The Empire of Bones Saga Volume 1 cover art
Into the Black cover art
A Sword Into Darkness cover art
14 cover art
No reviews yet