Donde termina el arco iris Cecelia Ahern

When they were kids, Rosie Dunne and Alex Stewart were inseparable, and exchanged notes throughout their classtime hours together. As they grew older their connection continued, though instead of folded notes they graduated to e-mails expressing their unconditional devotion. Through their correspondence, this novel tracks a friendship strong enough to continue from adolescence into their adulthoods in Boston and Dublin, with an ocean between them.