Stewart, C. R. (Author). Britfield series #4

"Book IV."

"After barely escaping Venice, Italy, Tom, Sarah, and Hunter have been trapped in Austria for six months as the country has become a fortress. The military and police are relentlessly searching every city, town, and village to capture them. Meanwhile, Oliver, Kate, and Henry have relocated to Poland where they are desperately trying to help the others escape. As time passes, Kate and Sarah have learned about three stolen Britfield artifacts once held by the Habsburgs and Romanovs. One is hidden in Vienna, another is located in Prague, and the third might be in St. Petersburg, Russia. If utillized together, they could unlock a worldwide treasure map of unimaginable riches. However, the clock is ticking as the Committee prepares to destroy the Resistance. Starting in Vienna, the exciting story travels to Prague, Berlin, Krakow, Warsaw, the Baltic Sea, other parts of Eastern Europe, and Russia. The unparalleled adventure is filled with sacrifices, revelations, betrayals, romance, and an extraordinary ending!"--Back cover