The Order of Time (Paperback)
"If you're into secret societies, time-travel, dangerous artifacts, deadly assassins, evil priests, and vengeful gods then I've got a story for you..."
Anastasia and Edward Upston are eleven years old twins who are different in almost every way. Despite this they are inseparable and the best of friends. They tackle the highs and lows of sixth grade together whether they are fending off bullies at the elite Blake Academy or examining rare antiquities as the Smithsonian Museum of Natural History. Then: life gets complicated.
They discover that their friend and mentor, Dr. Gregorian, is part of a secret society called the Order of Time. It turns out that time is not fixed, it's a fluid continuum where changes to the past can create ripples all the way through to the present. It unwittingly falls to the twins to travel back through time to ancient Egypt where they must overcome deadly assassins, evil high priests and vengeful gods in order to prevent disaster. Together Anastasia and Edward must navigate all obstacles to preserve the past and find their way back home.