Sequel to : Beyond the grave. "This edition is available for distribution only through the school market."--cover [p.4].
Summary:
"A strange telegram lures fourteen-year-old Amy Cahill and her younger brother, Dan, deep into Russia and away from the only trustworthy adult they know. Signed with the initials NRR, the telegram launches a race to uncover a treasure stolen by the Nazis and the truth behind the murder of the last Russian royal family. All too soon, the treasure hunt starts to smell like a Lucian trap. But the bait might just be irresistible--what will Amy and Dan risk to find out what really happened on the night their parents died?"--P. [4] of cover.
Series:
Thirty-nine clues, The ; 5 39 clues, The ; 5 39 clues ; https://id.loc.gov/authorities/names/no2009010548 5 Thirty-nine clues ; 5
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