Ruins by Amy Taylor

At a crossroads in their relationship, Emma and Julian agree to house-sit for a friend in Athens over the course of an oppressive summer.

Their plans take an unexpected turn when they meet Lena, an enigmatic young Greek woman who presents an opportunity for them to explore their relationship in uncharted and thrillingly risky ways. But as the heat in the city grows stifling, Emma and Julian find themselves far more entangled in Lena's life than they'd bargained for. What follows is a highly-charged three-way struggle for control, as Emma, Julian and Lena are suddenly faced with consequences far greater - and far more dangerous - than they could have predicted.