Nate the Great Saves the King of Sweden by Marjorie Weinman Sharmat illustrated by Marc Simont*

My first grader read this book to himself.  He loves this series.
While Rosamond is touring Sweden, she loses her troll.  She sends Nate a letter to find what she has lost (but she does not tell him what it is, when she lost it or where she lost it) or else she will hire the King of Sweden.
Can Nate solve a mystery even when he is not in the same country?!!
*Highly recommend.
-Borrowed from the library.
Guided Reading Level: K (end of 1st grade/beginning of 2nd grade)