"The Sixth Day: a Brit in the FBI Thriller" (Gallery Books), by Catherine Coulter and J.T. Ellison

Impossible assassinations and an ancient manuscript are only the beginning in "The Sixth Day," the latest thriller from the talented duo of Catherine Coulter and J.T. Ellison.

Nicholas Drummond and his partner, Michaela Caine, work for the FBI Covert Eyes team. Since Drummond is British, he's getting accustomed to the differences between his country and the United States. On vacation in Britain, the duo is pulled back into service for two crises: One involves a major hack from a mastermind in the digital world and the other involves the mysterious assassination of prominent government officials.

Drummond and Caine discover a blurry photo taken at the scene of the second murder that happened on the steps of 10 Downing Street. It shows a small drone in the air. Their team deduces this seeming toy is capable of shooting a tiny projectile. Both victims died from a deadly and rare poison, and they must quickly try to figure out who might be next.

Mixed in with the chaos is a mysterious and ancient manuscript that has baffled historians for centuries. The text appears to be gibberish, and several pages from it are missing. An expert on this manuscript has found the missing pages stored in the British Museum and thinks she can translate it. A madman hears this and believes that this information might hold the cure for his twin brother, who has a rare blood disorder. This man has the money, power and access to get what he wants, even if it means the bodies pile up along the way.

The previous novels in the series have all had Drummond as the odd man out while working in the United States. Since this story takes place on British soil, it's Caine's turn to be the fish out of water, and that aspect pays off in unexpected ways. The mix of history with the modern technology generates both horror and thrills. Coulter and Ellison have another amazing entry in this ongoing series, and a comment at the end of the novel hints at the possible next story the team will face.