~ tracking down this book ~
Isla has a rich, oppressive father, so runs away to Rio to work as an au pair to a young couple. Kyle is hired by her father to bring her back and to win her trust, meets her 'accidentally on purpose' and starts wining & dining her, eventually inviting her to go island hopping in his own plane - then, they crash, on a deserted Caribbean island and Kyle reveals who he is and that his aim was to bring her back to England and to her father. Despite initial anger at deception, true love wins out in the end...