The Unseen Sister
For DS Kat Ballantyne, finding the murderer might mean looking closer to home.
DS Kat Ballantyne is still reeling from a revelation that turned life as she knew it upside down. But when a dog walker discovers the body of a woman among the standing stones known locally as the Three Sisters, there’s no time to focus on her own troubles. Kat is drawn back to work to investigate.
At first, the death appears to be an accident. But then Kat discovers an infinity symbol branded onto the dead woman’s abdomen. She’s convinced there’s a vicious killer at large. Still juggling her turbulent private life with her professional duty, she begins to dig into the victim’s past. There, she uncovers shocking secrets and several potential suspects.
When a second woman is found killed in similar circumstances, Kat needs answers fast. Does she have a serial killer on her hands? Or is the perpetrator motivated by something more personal? What connects the victims? And can she catch the killer before anyone else turns up dead?
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Andy Maslen
Andy Maslen is an author whose gripping thrillers and sharp, fast-paced narratives have captivated readers around the world. With a knack for creating high-octane, edge-of-your-seat plots, Andy's novels draw readers into a world where danger lurks around every corner and nothing is quite as it seems.
Born and raised in the UK, Andy's early career was in marketing and advertising, where he honed his skills as a writer, learning how to grab attention and keep people hooked. But after years of crafting ads, he decided to turn his hand to something more personal—fiction. His transition from the world of advertising to the realm of suspense and thriller writing was a natural one. The same instincts that made him a successful copywriter—an understanding of pacing, suspense, and compelling characters—became the backbone of his novels.
Detective Kat Ballantyne
In the gritty underbelly of the city, where corruption runs deep and danger is never far behind, Detective Kat Ballantyne stands as an unflinching force of justice. The Detective Kat Ballantyne series invites readers into a dark world of suspense, where every case is a puzzle, and no one is as innocent as they seem.
Kat is a seasoned detective with a razor-sharp mind and an unwavering moral compass—traits that both serve her well and complicate her personal life. Tasked with solving cases that range from heart-stopping murder mysteries to complex conspiracies, Kat’s determination to uncover the truth often pushes her into dangerous territory, where she must confront not only the criminals she pursues but the ghosts of her own past.
Detective Kat Ballantyne consists of six books and series is set to expand with the upcoming release of one more book. The current recommended reading order for the series is provided below.

