On The Run (Left Behind: The Kids #10) by Jerry Jenkins, Tim LaHaye

Filled with despair over tragic news about their friends, Judd and Ryan set out for Israel to discover the truth. The trail leads them to a surprising find and into the hands of the Global Community. Back at home, Vicki, Lionel, and their friends plan to carry out another mission at Nicolae High, but not without great danger. What if they get caught? Will Vicki be sent back to the detention center now that Bruce is gone? Follow Judd, Vicki, Lionel, Ryan, and the growing Young Trib Force as they continue their heroic journey through the earth's last days.