All Liam ever wanted was to help Cassie reach her full potential; to push her body to new extremes. Exercise, determination, being the optimum versions of themselves together forever. And Liam always knew what was best.

Nothing could break their intense love for one another, not Liam's obsessive desire for physical perfection or his relentless control of every aspect of Cassie's life.

Until the day he pushes Cassie far beyond her limits, and she walks out of their flat and away from their toxic relationship for good.

Two years on and Cassie is stronger, fitter, healthier than ever before. And then she sees him - Liam - those green eyes, those stirring muscles. Something inside her flips.

But she holds the power now.

It's Liam's turn to sweat.