I decided to read this book for two reasons. one, I have read this book before and I liked it. Second, it was in the American Girl section, an I like American Girl books.
Famous Professor Whaston is onboard the same ship that adopted sisters, Samantha and Nellie, are on. One night the lights go out at dinner and the Blue Star Sapphire that Professor Whaston has to give to the British Mueseum, goes missing! Samantha and Nellie prove that the professor's nephew, Harry, stole the Blue Star Sapphire.
I liked this story because it is mystery. You can solve it just like the character in the book!
It is also fun to see what steamer ships were like a long time ago, since the story is set around 1906.