"Leo has explored the zany, wonderful Whippet Hotel from basement to top floor, with trains, flying goats, and mazes (among other things) in between. But even Leo doesn't know every secret of the Whippet - and when he discovers that there's more beneath the hotel than he'd thought, it doesn't take long for more adventures to unfold!"--Dust jacket.

Captain Roland Warvold tells Alexa and Yipes about the adventures he shared with his brother Thomas in Elyon, before the wall went up and divided the world in two.

Un extraño telegrama firmado con las iniciales NRR lleva a Amy y a Dan a la lejana Rusia. En él los invitan a superar una prueba contrarreloj en la que deben encontrar un tesoro robado por los nazis y descubrir la verdad sobre el asesinato de la última familia real rusa. After receiving a telegram from the mysterious "NRR", Dan and Amy leave for Russia. Upon their arrival, another hint from NRR leads them to a credit card and false passports belonging...