The Ex-Husband : The perfect thriller to escape with this year - Karen Hamilton

She's safe from him, a thousand miles from harm. Or so she thought. Charlotte and Sam were partners. In life, and in crime, but that's all behind her. Until now, years later, it comes rushing back when her estranged ex-husband Sam suddenly goes missing. And someone threatens to expose what she did. Desperate to escape her mysterious tormentor, Charlotte boards a luxurious superyacht in the Caribbean. But it soon becomes clear that the open ocean isn't the haven she thought it was. Because they are onboard too. And now there's nowhere left to run.