Marbella War (Marbella #9) by Cami Oster

Things are heating up in Marbella. Samara Azmer still has to put up with the presence of her vitriolic ex-husband in her town, although his behaviour is growing more confusing, which is a ploy she'd seen him use against his enemies before. The same is observed by his beautiful girlfriend, Lamia, who hates his pre-occupation with his former wife. Meanwhile, Trish's newly arrived cousin, Tilly, is charmed by the younger Azmer, Darius, who introduces her to a lifestyle she's never known. However, she's learning that lifestyle comes with a price. It's all an untenable situation, and Samara knows that things have to change, and maybe the only way to achieve it is to go for the jugular. Not an easy task when it comes to Hassan Azmer, who knows those moves all too well.