Trapped on the D. C. Train!

All aboard the D.C. train for the 13th book in the Washington mystery series, Capital Mysteries!

Marshall and KC have tickets to ride! They're taking the express train from Union Station—it even has a special VIP car at the back just for the vice president, the kids, and the secret service agents to travel in. But while KC and Marshall are exploring the train, someone unhitches the vice president's car! And now that someone is searching, car by car, for KC and Marshall. There's nowhere to run!