With "She and Allan" (1920), Haggard engineered a crossover between his two most popular series, uniting Quatermain with Ayesha, the central character of his hugely successful "" novels, and bringing in several other key characters from each series—Hans, Umslopogaas, and Zikali from the Quatermain series, and Bilali, Ayesha's faithful minister. This book formed the third part of the "She" trilogy, although in chronological terms, it necessarily served as a prequel to the first two "She" books, since Holly and Leo, the protagonists of the first two books, both die at the end of the second novel.