Tough-as-nails Troubleshooters operative Sam Starrett learns the agony of loving someone in danger--and the hell of waiting on the home front--as his wife, Alyssa, hurtles into a foreign hot spot that's about to boil over. Navy SEAL Frank O'Leary's ill-fated holiday reunion with his older brother takes a turn for the better--when a chance encounter on a rainy New Orleans street gives Frank a reason to be thankful after all. In a maze of tunnels deep beneath a military base in Germany, Jules Cassidy, Alyssa Locke, and their comrades in arms match wits with terrorists on a mission with explosive consequences.