Commander Gray Perce and the Sigma Force confront humankind's greatest threat in an adventure that races from the Roman Coliseum to the icy peaks of Norway, from the ruins of medieval abbeys to the lost tombs of Celtic kings. The ultimate nightmare is locked within a talisman buried by a dead saint--an ancient artifact known as the Doomsday Key--and a secret that has already claimed the lives of a famed geneticist, a Vatican archaeologist, and a...

"When Iranian-American Kamran Smith learns that his big brother, Darius, has been labeled a terrorist, he sets out to piece together the codes and clues that will save his brother's life and his country from a deadly terrorist attack." -- Provided by publisher.

"Commander Gray Pierce and Sigma Force--joined by a pair of Vatican historians--race to discover a truth tied to the fall of the Roman Empire, to a mystery bound in the roots of Christianity's origins, and to a weapon hidden for centuries that holds the fate of humanity"--Page 4 of cover.

Amy and Dan Cahill are no strangers to impossible tasks. After seven of their relatives were kidnapped, the siblings scoured Europe for the priceless artifacts Vesper One demanded in exchange for the hostages. But then the Cahill kids are given an assignment that pushes them to their breaking point-a journey to a legendary city. Amy and Dan know they can't afford to fail, yet they're running out of options. . . and running out of time.

An ancient artifact is discovered in a dusty antiquities shop in Alexandria, Egypt the long forgotten trinket soon becomes the cent re of the most deadly archaeological hunt in history. The 20,000 year-old relic is inscribed with what appears to be the long lost language of Atlantis. Only one man would seem to be able to decode its meaning the world's foremost linguist, Dr Thomas Lourdes but only if he can stay alive long enough. Meanwhile, an earthquake...

"Working for the FBI, cryptanalyst and agoraphobe Salem Wiley vows never to return to the conspiratorial underworld her mother revealed to her. Until fieldwork draws Salem to an Ireland farm where a curious discovery has been unearthed: a near-perfect replica of Stonehenge in miniature--except for one extra stone engraved with the word mercy. When seven-year-old Mercy Mayfair, a child in Salem's family's care, is kidnapped, Salem knows it's more than...

It started with a kidnapping. A shadowy organization known only as the Vespers snatched seven members of the Cahill family and demanded a series of bizarre ransoms from around the world. Thirteen-year-old Dan Cahill and his older sister Amy began a global treasure hunt, determined to bring back whatever Vesper One needed, so long as it kept the hostages safe. But when they deliver the last ransom, Amy and Dan discover Vesper One's terrifying endgame....

"1940. Facing a seemingly endless war, fifteen-year-old Louisa Adair wants to fight back, make a difference, do something--anything to escape the Blitz and the ghosts of her parents, who were killed by enemy action. But when she accepts a position caring for an elderly German woman in the small village of Windyedge, Scotland, it hardly seems like a meaningful contribution. Still, the war feels closer than ever in Windyedge, where Ellen McEwen, a volunteer...

"World War II has just ended, and Britain has established the Control Commission for Germany, which oversees their zone of occupation. The Control Commission hires British civilians to work in Germany, rebuild the shattered nation and prosecute war crimes. Somewhat aimless, bored with her job as a provincial schoolteacher, and unwilling to live with her overbearing mother any longer, twentysomething Edith Graham applies for a job with the Commission--but...

"An enigmatic message leads the Code Busters on a treasure hunt on creepy Alcatraz Island, where they must use their problem-solving skills to unravel the mystery"--