There Will Be Blood

Author Jonas Saul (Sarah Roberts Series) and Rania Stone (What He Didn't Know) team up to write the dark thriller There Will Be Blood.
The mafia never forgets an enemy. And Darwin Kostas can't allow them to remember.
Ten years ago, Darwin Kostas narrowly escaped the clutches of multiple mafia families. Living off the grid in Europe, he has remained hidden from those who remember the past, those who would want to seek revenge. That is until his real identity is leaked, along with the names and addresses of others like ex-spies, ex-mercenaries, and black operations soldiers.
Meanwhile, a woman has gone missing from her hotel on the island of Rhodes in Greece. When investigators arrive to look into the matter, a hotel security team member is found dead. Later that day, another body is discovered.
Connected to Darwin's search for the information leak, he must get there and shut it down. Using a group of highly-trained mercenaries, Darwin works against the clock-and the authorities-to ensure his personal information doesn't get into the wrong hands, and the only way to do that is to shed blood.
One thing is for sure-with that many trained killers in one hotel, There Will Be Blood-and a lot of it.