Dirty Diamonds by Ella December

Everyone has a secret. 
We are all hiding something - or someone.

Carter Wolfe has his sights set on becoming Mayor of London, but his political plans would be scuppered if the lid is blown off the secret he is harbouring. Carter is caught up in a steamy affair with Harley Jade Diamond, a journalist whose career thrives on exposing the elite. Harley works at SCANDAL magazine. She reports the secrets of the rich and powerful... but will her own scandalous past come to light?

Read the first few chapters here - https://www.wattpad.com/story/21626721-dirty-diamonds