I really liked the way Jillian and her friends went back in time to spend three months at school in her mom's time and thought Jillian's mother Beth was a really great character because she was kind and seemed like a really great friend to have. I liked the suspenseful parts, and my eyes were wide the whole time I read them. Another part I liked was that Jillian and her grandfather were the only people that knew their little secret (you have to read the book to find out what it is.) I also liked Sam's personality because she seemed a lot more daring than Meg and Sadie, though I felt like it changed halfway through the book because she was a lot more cautious and frightened torward the end. I wish that I knew a little more about Meg being a sailor because those parts were really interesting. I also felt the ending was way too abrupt. The last adventure I felt could have been a little more exciting instead of Jillian and her friends just being lead to the solution without them doing anything. However, in conclusion, though some parts were a little disappointing, the good parts overruled the bad parts in this book and I'm glad I could read it.