Darkfall - The Wasteland

The second story in The Wasteland series. A woman determined not to repeat the past and a Scottish former SAS soldier reunite to survive in a challenging new world forged by an apocalypse no one could stop. Penny Graham once fought her powerful attraction to former Special Air Service soldier Ian MacDaniel. But when their undeniable attraction was condemned by her father, they parted ways. Apocalypse pushes people to violence, and when she turns to her father for help, Ian eagerly volunteers to rescue Penny.
Forced to fight for survival while trapped in a bunker, Ian and Penny can't ignore the desire still sizzling between them.