The White Woman on the Green Bicycle: Monique Roffey

When George and Sabine Harwood arrive in Trinidad from England. George instantly takes to their new life, but Sabine feels isolated, heat-fatigued, and ill at ease with the racial segregation and the imminent dawning of a new era. Her only solace is her growing fixation with Eric Williams, the charismatic leader of Trinidad's new national party, to whom she pours out all her hopes and fears for the future in letters that she never brings herself to send. As the years progress, George and Sabine's marriage endures for better or worse.
When George discovers Sabine's cache of letters, he realises just how many secrets she's kept from him and he from her - over the decades. And he is seized by an urgent, desperate need to prove his love for her, with tragic consequences ...