We all know what psychopathy is. Or, at least, we think we do.

For decades, we have looked at psychopaths as something 'other': as monsters, or bogeyman. But psychopaths don't just exist on our screens - they exist in our communities, offices and, sometimes, in our very own families.

The Psychopath Effect is the story of the psychopaths among us, those who are searingly antagonistic yet still have a job. Those who approach empathy as an optional extra, yet still have a family. Through case studies and new research, we finally see the mind-altering, everyday effects of those who reduce our ability to think rationally, and who remake our worlds into something unrecognisable.

In this ground-breaking new book from expert psychologist Dr Emma Kavanagh, the potent impact of the psychopath effect is finally exposed. From friends to colleagues, partners to parents, the psychopaths among us are busily trying to alter our brains. Finally, we have a way to spot them to try to reverse their damage.

'Psychopathy only works if the environment allows it. And we are the environment.'

'A thrill a minute - I loved it!' Clare Mackintosh NO ONE KNOWS THE MIND OF A KILLER LIKE EMMA KAVANAGH. I've been watching you DS Alice Parr. I saw you trying to save the poor young woman you found in the park. The woman I tried to kill. I've been waiting for you to find her family. To find someone who cares about her. But you can't can you? You've never had a case like this. I know everything about you. You know nothing about me. Even though I'm the man you're looking for. And you will never catch me... 'To Catch A Killer is one of my favourite books of the year. The intricate, clever story is told well, and the characters are brilliantly drawn.' Rachel Abbott 'Fast-moving. Unexpected twists. Punchy writing. This author has teeth! A perfect thriller for winter nights!' Jane Corry 'A real white-knuckle ride of a thriller that packs a big emotional punch. This is top class crime writing.' Tammy Cohen 'Wow. Whether you like fast-paced thrillers or in-depth (spot-on) character-led mysteries, you're going to love To Catch a Killer by Emma Kavanagh. LOVED it.' Caz Frear 'This transatlantic thriller has elements of Bourne and Lee Child while remaining true to its British police procedural roots. Beautifully written, expertly paced and highly entertaining.' Sinead Crowley 'Pacy, emotional and a cracking read!' Jane Isaac 'A darkly brilliant tale of psychological manipulation, which I was entirely hooked by, from page one. Bravo, Emma!' Kate Rhoades 'I absolutely loved it. I was completely hooked from the start, it was a stunning read. Plus the ending blew me away.' Rebecca Bradley 'To Catch a Killer is a pacy cat-and-mouse thriller with real depth and a protagonist I want to go for a drink with. A brilliant character-driven story perfect for anyone who adores a twisting, turning read. I loved it.' Amanda Jennings

A gripping psychological thriller by a former police psychologist. Perfect for fans of Nicci French, Tana French and S. J. Watson. HE'S WATCHING A gunman is stalking the wards of a local hospital. He's unidentified and dangerous, and has to be located. Urgently. Police Firearms Officer Aden McCarthy is tasked with tracking him down. Still troubled by the shooting of a schoolboy, Aden is determined to make amends by finding the gunman - before it's too late. SHE'S WAITING To psychologist Imogen, hospital should be a place of healing and safety - both for her, and her young niece who's been recently admitted. She's heard about the gunman, but he has little to do with her. Or has he? As time ticks down, no one knows who the gunman's next target will be. But he's there. Hiding in plain sight. Far closer than anyone thinks...

This is a brilliant debut psychological thriller by a former police psychologist. It is perfect for fans of Nicci French, Tana French and S. J. Watson.

A plane falls out of the sky. A woman is murdered. Four people all have something to hide.

Jim is a retired police officer, and worried father. His beloved daughter has disappeared and he knows something is wrong. Tom has woken up to discover that his wife was on the plane and must break the news to their only son. Cecilia had packed up and left her family. Now she has survived a tragedy, and sees no way out. Freya is struggling to cope with the loss of her father. But as she delves into his past, she may not like what she finds.

"Before the plane crash, after the plane crash, such a short amount of time for the world to turn on its head."