"She and Allan" by H. Rider Haggard is an adventurous crossover featuring Allan Quatermain and Ayesha, the mysterious queen from "She." Quatermain, seeking answers about life and death, joins forces with Ayesha in a journey filled with danger, supernatural elements, and ancient secrets. Haggard's vivid storytelling and rich characters create an enthralling tale of adventure and mysticism in Africa.