Filthy Rich by Katya Stern

Tara is on the edge of everything she’s ever dreamed of. A massive deal. Billions of dollars on the line and only one thing standing between her and the biggest deal of her career: James Stockton.
A mysterious billionaire known for his innovative practices and cunning negotiation skills, as much as his boyish good looks and flamboyant demeanor. He had a flare for the dramatic, an affinity for the unexpected. Now he’s missing and it’s up to Tara to hunt him down.

But when she does the big deal is the last thing on her mind as she is swept into a world of mystery and intrigue. Impossible danger and unimaginable luxury. The world of billionaires. Where money rules, and everyone has an ulterior motive.
In this world where friend and foe are identical. Who can she trust?

…and who can she love?