The men of SEAL Team Sixteen take on a truly challenging opponent: Troubleshooters, Inc., the civilian counterterrorist team of former SEAL commanding officer Tom Paoletti's civilian counterterrorist team. The two groups face off as part of a winter training exercise in the mountains of New Hampshire, where, despite the cold weather and meager accommodations, they find the assignment a pleasurable one - particularly for Petty Officer Mark Jenkins, who has helped get his sister's best friend (and his seventh-grade crush) Tracy Shapiro a job as the Troubleshooters' new receptionist.

But it's Troubleshooters operative and former LAPD detective Lindsey Fontaine who understands all his jokes. Jenk and Lindsey becomes friends - and then more - as the two teams train together.

The real world intervenes, however, when Tracy goes missing in the freezing woods. As hours stretch into days, the search widens - but she's vanished without a trace. Soon the bodies of brutally tortured women are discovered beneath the ice of a flooded quarry, and it becomes clear that a serial killer has made this area his home.

Lindsey soon finds herself isolated in the killer's snowbound lair, while Jenk desperately races against time, fighting the elements to reach her. Can they bring a violent perpetrator to justice and rescue their missing friend?