1. 39 clues The Black Circle

2. introduction
39 clues the black circle is book 5 in the series, Dan and Amy Cahill that are sister and brother go on an adventure to Russia to find clues to their puzzle.

3. Their journey begins
Their journey starts at their house and they travel by a cab to investigate what Hamilton Holt has done. They also help fight off the Nazis.

4. Our favorite part
In the 39 clues the black circle our favorite part is when they tie a character to a chair and make him tell them the truth.

5. If your interested?
I suggest this book to anyone who likes mystery's.