Ben and Lily couldnt be more different. Hes flash, brash Bermondsey boy an advertising man and shes a quiet, bookish English teacher from genteel Beckenham. In fact, the only thing they seem to have in common is their mutual dislike of one another that and their participation as inmates in a clinical trial. Then everything changes. Suddenly, theyre hopelessly, happily in love and blissfully unaware of the strangeness of their new-found feelings. But when Ben begins to wonder about the possible side effects of Pherexosol, the experimental drug theyre both on, and makes the decision to stop taking the pills, their relationship shifts yet again. Only this time, everythings just a little more complicated and they both have far too much to lose.