Capture the Flag by Kate Messner*

Anna, Jose, and Henry meet while they are stuck in an airport during a winter snowstorm.  During their stay, news breaks out that the flag that inspired Frances Scott Key to compose "The Star-Spangled Banner" has been stolen.  When all three discover that they have family members part of the Silver Jaguar Society, sworn to preserve the world's historical artifacts, they set out to find the missing flag at the airport and capture who stole the flag.
Crazy events like driving airport vehicles and scrambling in the luggage area coupled with loyalty to friends and mankind make this book a winner!
Point to discuss: I did not like how a political character who wanted immigration reform was portrayed.  The author made it seem like those who want immigration reform are prejudice and narrow-minded.  A bit of subtle politics was integrated into the story.
*Highly recommend.
Guided Reading Level: V (5th/6th grade)
Grade Level Equivalent: 4.3
More books in series-Silver Jaguar Society Mysteries
                                  #2 Hide and Seek
                                  #3 Manhunt