"The Kidd children--including twelve-year-old twins Rebecca and Bickford--follow mysterious clues that take them from China to Germany, in the hopes of finding their missing father and the treasure that will finally free their kidnapped mother"--Provided by publisher.
Treasure hunters ; 
Brothers and sisters -- Fiction.
Buried treasure -- Fiction.
China -- Fiction.
Germany -- Fiction.
Missing persons -- Fiction.
Twins -- Fiction.
Neufeld, Juliana, 1982- illustrator.