Love Among the Ruins by Lily Zante

When a jaded waitress meets an obnoxious billionaire, all hell breaks loose.

Eleni Trakas longs to leave the picturesque Greek island where she grew up – a place that attracts the wealthy she has come to despise.
Dominic Steele, the grumpy son of an American billionaire, has been sent to Athens for the summer to negotiate a shipping deal with one of Greece’s most formidable shipping magnates.
Singularly focussed, Dominic doesn’t do small talk, hates to mingle and despises ineptness.
So when their worlds collide, things go horribly wrong.
Despite her contempt for the rich, Eleni ends up working for the moody billionaire.
And with a change of scenery, she soon relaxes as life takes a turn for the better.
How can it not when her mercurial, yet irritably handsome, boss seems a changed man himself?
Cocktails, tequila, summer parties, and gorgeous Greek villas beckon.
Not to mention the glittering pool.
A slowly simmering attraction starts to sizzle out of control.

But secrets soon unfurl, leading to startling truths which these lovers must confront.