My Dear Cousin — Celine Conway

Most girls would be delighted to have the opportunity to visit Africa, but Lisa was not much looking forward to the prospect -- to the prospect, at any rate, of meeting her cousin Adrian again.

It was seven years since they had met, but she still remembered how she had never been a match for his mocking self-assurance, his disconcerting arrogance. Perhaps, though, she told herself, he had changed, had mellowed since those days.

But he hadn't, as Lisa found the moment she arrived in Rhodesia