diff --git a/chapter-13/src/main/scala/sample/snippet/Books.scala b/chapter-13/src/main/scala/sample/snippet/Books.scala
index 79029f4..558156e 100644
--- a/chapter-13/src/main/scala/sample/snippet/Books.scala
+++ b/chapter-13/src/main/scala/sample/snippet/Books.scala
@@ -17,7 +17,7 @@ class Books {
     val current = book
     val authors = Model.createNamedQuery[Author]("findAllAuthors").getResultList
     val choices = authors.map(author => (author.id.toString -> author.name)).toList
-    val default = (Box !! book.author).map(_.id.toString) or Empty
+    val default = Full(Authors.authorVar.is.id.toString)
     
     "type=hidden" #> SHtml.hidden(() => bookVar(current)) &
     "name=title" #> SHtml.text(book.title, book.title = _) &
diff --git a/database/chapter_13.h2.db b/database/chapter_13.h2.db
index c4f3a3e..5df5cb7 100755
Binary files a/database/chapter_13.h2.db and b/database/chapter_13.h2.db differ