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Publisher's Summary

One of the greatest achievements in human history.
A secret that was never supposed to be found.
And a crisis that cannot be stopped.
Deep in the Caribbean Sea, a nuclear submarine is forced to suddenly abort its mission under mysterious circumstances. Strange facts begin to emerge that lead naval investigator, John Clay, to a small group of marine biologists who are quietly on the verge of making history.
With the help of a powerful computer system, Alison Shaw and her team are preparing to translate the first two-way conversation with the planet's second smartest species. But the team discovers much more from their dolphins than they ever expected when a secret object is revealed on the ocean floor. One that was never supposed to be found.
Alison was sure she would never trust the military again. However, when an unknown group immediately becomes interested in her work, Alison realizes John Clay may be the only person she can trust. Together they must piece together a dangerous puzzle, and the most frightening piece, is the trembling in Antarctica.
To make matters worse, someone from the inside is trying to stop them. Now time is running out...and our understanding of the world is about to change forever.
©2013 Michael C. Grumley (P)2017 Michael C. Grumley
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Customer Reviews

Most Helpful
5 out of 5 stars
By FocusedOnTheJourney on 07-22-17


I listened to this book and couldn't stop. Every single break at work, every moment in the gym, every ride in the car this book was playing. The writing was phenomenal and the mind blowing plot had me hooked. I CAN'T WAIT to read LEAP and the rest of the series. I do wonder how much of this was science and how much was pure fiction. Either way I was thoroughly entertained and intrigued.

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19 of 20 people found this review helpful

5 out of 5 stars
By D. Backshall on 11-16-17

A fantastic sci-fi adventure novel

How am I just now hearing about Michael C. Grumley? This guy writes old school adventure sci-fi like a boss! Reading Breakthrough made me reminiscent for other favorites like The Swarm, Beast, and Jurassic Park, to name a few.

Does all the science add up? Pish posh, of course not, but who cares? It works. Does it make for a great story, where you cheer on the heroes, cry for the innocents, and hold your breath when something goes boom? Yes, yes, yes!

On my TBR short list there are a few novels waiting, including some from some potentially wonderful indie authors, but darn it all, they'll have to wait. I have Book 2 (Leap) and Book 3 (Catalyst) here in my library, and I...can' It's like an addiction.

I have this overwhelming urge to go watch "The Poseidon Adventure" now. And maybe "Voyage to the Bottom of the Sea", if I can dig up that ancient old series anywhere. I want to revisit my old adventure sci-fi roots. Where can I find old episodes of "Flipper"?

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23 of 25 people found this review helpful

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Customer Reviews

Most Helpful
5 out of 5 stars
By Amazon Customer on 09-11-17

Thoroughly enjoyed this book, and now bought Leap

If you could sum up Breakthrough in three words, what would they be?

Good old fashioned adventure story, very much in the ilk of Clive Cussler I thought. There will be those who will not agree, but I listen to a very eclectic selection of books, and sometimes I just want to wallow in some good old mind candy, and this fits the bill. Narration by Scott Brick is as excellent as always. A romping yarn that passed very quickly. Loved it.

Who was your favorite character and why?

I suppose Sally and Dirk -

Which scene did you most enjoy?

I listened in one sitting, so cannot really pick out one part

Was this a book you wanted to listen to all in one sitting?

I did - straight through

Any additional comments?

As I said before, I enjoy a fantasy adventure to just relax and wallow in it. I honestly thought it was a Cussler novel at times.

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1 of 1 people found this review helpful

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Customer Reviews

Most Helpful
5 out of 5 stars
By Luke on 10-25-17

An excellent story that is well written.

This story is rather refreshing with unique ideas and plots. There's just the right amount of characters balanced with a good ratio of detail and action/suspense. It does, however, start a bit slow. But once it speeds up, it flows really well. I'm certainly eager to read the next one in the series. Scott Brick, as always, nails the performance.

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