Three women. One toxic ex. And a breakup that might kill them.

Ivy thought heartbreak was the worst thing he could do to her.

Then came the headaches. The exhaustion. The hair falling out.

And every doctor insisting it was all in her head.

Until Roisin appears on her doorstep with the same symptoms, the same ex - and a terrifying theory:

He did this to us.

Charming, obsessive and impossible to quit, their ex has been draining the life from his girlfriends.

Now he has a new target: Evanthe.

But Ivy and Roisin refuse to let another woman become his victim. Together, the three of them decide to fight back.

Because monsters don't always look like monsters.

And revenge can have a life of its own.

He's the problem.

They're the solution.

Praise for An Ethical Guide to Murder: 

'Dark, funny and gripping' Heat, Book of the Week

'This is high-concept, high-octane, hi-jinks and I'm here for it' Maz Evans

'[A] clever, beguiling novel' The Times