Codename Villanelle by Luke Jennings

The basis for Killing Eve, now a major BBC TV series

In this gripping thriller, a highly skilled and enigmatic assassin, known only by her codename, is on a relentless mission across Europe, leaving a trail of chaos and intrigue in her wake. Her lethal prowess and cold-blooded efficiency make her a formidable force, yet her mysterious past and motivations remain shrouded in secrecy. As she navigates a world of espionage and danger, a determined intelligence agent becomes obsessed with tracking her down, setting the stage for a high-stakes game of cat and mouse that blurs the lines between hunter and hunted.