Patricia Reilly Giff

Sam is almost 11 when he discovers a locked box in the attic above his grandfather Mack's room, and a piece of paper that says he was kidnapped. There are lots of other words, but Sam has always had trouble reading. He's desperate to find out who he is, and if his beloved Mack is really his grandfather. At night he's haunted by dreams of a big castle and a terrifying escape on a boat. Who can he trust to help him read the documents that could unravel the mystery? Then he and the new girl, Caroline, are paired up to work on a school project, building a castle in Mack's woodworking shop.

Lily is looking forward to spending another summer at her family's vacation home with her grandmother on the shore in Rockaway, New York, when her father drops the news that he must go to Europe with the U.S. Army Corps of Engineers during World War II. Angry at her widower father for leaving, Lily refuses to say goodbye to him and is certain that this summer will be lonely. Then she meets Albert, a Hungarian refugee who lost most of his family to the war and had to leave his sickly sister behind in Europe.