Deep Dark (The DeLuca Family #3)
Amy Reece

But when that mystery man suddenly appears again in the flesh, she’s forced to face the truth she’s tried so hard to hide.
Then, while looking into a lead on a business associate, she stumbles across something big—big enough to get Homeland Security involved—and soon finds herself embroiled in an investigation of possible domestic terrorism.
Who knew love—and bookkeeping—could be so hazardous?