The mystery: shocking.

When several major political figures die mysteriously, officials blame their deaths on natural causes. However, when a small drone is spotted at the scene of the most recent death, it quickly becomes clear to FBI agents Nicholas and Michaela that there's more to this mystery than meets the eye.

The key: indecipherable.

Dr. Isabella Marin is a language expert, and she's dedicated her entire life to researching an ancient text that has long been considered indecipherable...that is, until now. When it becomes clear that there's an alarming pattern between the text and the recent deaths, she teams up with the FBI to find the link. It's clear that the manuscript is the key to catching the killer. But how?

The case: nearly impossible.

When Nicholas and Michaela uncover plans for a devastating attack on London, they must race against the clock to stop the killer before it's too late. Not only are they in danger of losing the manuscript--an object of extreme value--but they're also at risk of losing more innocent lives: including their own.

With their signature heart-pounding tension and suspense, Catherine Coulter and J.T. Ellison's The Sixth Day is "another amazing entry in this ongoing series" (Associated Press).