Princess for a Week by Betty Ren Wright

"Boys and girls alike will appreciate the mix of classic and contemporary elements in this creepy, suspenseful middle-grade mystery" (The Bulletin of the Center for Children's Books ).
Roddy Hall overhears his mother saying "Princess" is coming to visit. He's excited-he's always wanted a dog. But then he finds out that- ick-Princess is a girl and- yuck-she'll be staying for a whole week. One night, Princess, Roddy, and his best friend, Jacob, notice a mysterious car pull up to an abandoned house. Could it be a burglar? Or worse yet, a ghost? Princess is determined to find out, and against his better judgment, Roddy goes along with her. They sneak out of the house to investigate-but will they be ready for what they might find?

Princess for a Week is a Society for School Librarians International Honor Book.