Sands of Time — Monique Martin

The Crosses--high-spirited Elizabeth and her brilliant Professor of the Occult husband, Simon--find themselves, along with Jack Wells, in 1920 Cairo on a special assignment for the Council for Temporal Studies. It seems like a simple enough mission---find a missing pocket watch and bring it back to the present. The only problem is, they're not the only ones looking.

 With danger lurking around every corner, Simon and Elizabeth race against a shadowy foe who is after far more than just a watch. The price for success this time just might be their lives.