Dawn's Light by Terri Blackstock
This is #4 in Blackstock's Restoration series of Christian suspense novels. It seems to involve "the end of a global electrical blackout and murder."
Fire and Ice by Anne Stuart
This is romantic suspense, and the author's site has this description:
In the wake of a failed love affair, brainy beauty Jilly Lovitz takes off for Tokyo. She's expecting to cry on her sister Summer's shoulder, then spend a couple months blowing off steam in Japan. Instead, she's snatched away on the back of a motorcycle, narrowly avoiding a grisly execution attempt meant for her sister and brother-in-law.
Her rescuer is Reno, the Committee's most unpredictable agent. They'd met once before and the attraction was odd – tattooed Yakuza punk meets leggy California egghead – but electric. Now Reno and Jilly are pawns in a deadly tangle of assassination attempts, kidnappings and prisoner swaps that could put their steamy partnership on ice.