Colder Than Sin - Cold Justice - The Negotiators, #2

Hostage Negotiators can talk themselves out of anything-except falling in love. Top FBI negotiator Quentin Savage is hurled into his worst nightmare when a terrorist attack on a luxury hotel propels him from esteemed keynote speaker to powerless captive. Haley Cramer is co-owner of a private security firm and prides herself on her independence, but she is shaken to the core when gunmen attack a conference she is attending.
She survives, but only because Quentin Savage pretends she's his wife. Together Savage and Haley plot their escape from a ragtag army of brutal but efficient thugs while struggling to figure out exactly who the enemy is. Why was the conference attacked, and why was Quentin a specific target?