In the race to save one of their own, Sigma Force must wrestle with the deepest spiritual mysteries of mankind in this mind-expanding adventure from the #1 New York Times bestselling author, told with his trademark blend of cutting edge science, historical mystery, and pulse-pounding action.

Arriving home on Christmas Eve, Commander Gray Pierce discovers his house ransacked, his pregnant lover missing, and his best friend's wife, Kat, unconscious on the kitchen floor. With no shred of evidence to follow, his one hope to find the woman he loves and his unborn child is Kat, the only witness to what happened. But the injured woman is in a semi-comatose state and cannot speak -- until a brilliant neurologist offers a radical approach to "unlock" her mind long enough to ask a few questions.

What Pierce learns from Kat sets Sigma Force on a frantic quest for answers that are connected to mysteries reaching back to the Spanish Inquisition and to one of the most reviled and blood-soaked books in human history -- a Medieval text known as the Malleus Maleficarum, the Hammer of Witches. What they uncover hidden deep in the past will reveal a frightening truth in the present and a future on the brink of annihilation, and force them to confront the ultimate question: What does it mean to have a soul?

• We started tracking this book on March 13, 2018.
• This book was $14.99 when we started tracking it.
• The price of this book has changed 32 times in the past 2,585 days.
• The current price of this book is $1.99 last checked 17 hours ago.
• The lowest price to date was $1.99 last reached on April 7, 2025.
• This book has been $1.99 2 times since we started tracking it.
• The highest price to date was $14.99 last reached on June 27, 2018.
• This book has been $14.99 2 times since we started tracking it.
• This book is currently at its lowest price since we started tracking it.

• Literature & FictionAction & AdventureMystery, Thriller & SuspenseCrime

• Text-to-Speech: Disabled
• Lending: Disabled
• Print Length: 616 Pages
• File Size: 122 KB