Leap
It was one of the greatest breakthroughs in human history. An achievement that stunned the entire world. And it was only the beginning.
Facing the cold, clear glass, Alison Shaw stared nervously into the giant seawater tank. It was just one year ago that she and her team of marine biologists had stunned the world with their incredible breakthrough. And now, they were about to do it again. But an ocean away, something strange was unfolding.
Along a lonely coast in South America, an experimental Russian submarine, long thought to have been dismantled, has suddenly resurfaced. And the US Navy has taken notice, sending Officers John Clay and Steve Caesare to investigate.
The sub has been studying a group of unmarked soldiers. Disappearing into the jungle each night beneath the cover of darkness. Something has been discovered...something big. And it's about to fall into the wrong hands.
Unless Alison Shaw and her team can find something that no one else can.
Michael C. Grumley
For years, Michael Grumley dreamed of writing thrillers the way he thought they should be written; complex, multi-genre stories with unique plots that 'move'. Enter BREAKTHROUGH, AMID THE SHADOWS, and THROUGH THE FOG: all deeply human stories with endings you will never see coming.
Michael C. Grumley lives in Northern California with his two young daughters. He’s an avid reader, runner and most of all father, and dotes on his girls every chance he gets.
He is currently working on the next Breakthrough installment.
Breakthrough
Breakthrough consists of six primary books, and includes one additional book that complement the series but is not considered mandatory reads. The current recommended reading order for the series is provided below.

