Undercover Geisha — Judith Cranswick

A perilous race across Japan to uncover the geisha's secret.Harry and Aunt Jessica's holiday tour of Japan takes a dramatic turn when Harry witnesses the stabbing of a geisha. As the woman dies in his arms, she entrusts him with a secret and dangerous mission, to deliver a key to White Tiger. The geisha has mistaken Harry for someone called Fox. Who is the real Fox, where and who is White Tiger and what does the key open? Unless he and Aunt Jessica can unravel the mystery, they too could end up dead.