H. Rider Haggard 
Lady Luna and the Taduki Drug (Fantasy Trilogy) [EPUB ebook] 
Allan Quatermain Adventures: The Ivory Child, The Ancient Allan & Allan and the Ice-gods

Lady Luna & the Taduki Drug is fantasy trilogy featuring Allan Quatermain, an English-born professional big game hunter and occasional trader living in South Africa.
‘The Ivory Child’ – While Quatermain visits Lord Ragnall, he receives a visit from Harut and Marut, priests and doctors of the White Kendah People who come to ask him for help. The White Kendah people are at war with the Black Kendah people who have an evil spirit for a god. Quatermain must return to Africa and destroy this evil spirit before it kills every one of the White Kendah People. In the meanwhile, Harut and Marut present Lady Ragnall the taduki drug that induces visions of previous incarnations. These visions create special connection between Allan and Lady Ragnall.
‘The Ancient Allan’ concerns one of Allan Quatermain past lives. Allan and Lady Ragnall inhale taduki, a drug that induces visions of previous incarnations. Thus, Quartermain relives the experiences of ancient Egyptian aristocrat Shabaka (a descendant of the pharaoh of the same name)—alongside flashes of his earlier lives—and Luna those of Amada, an ancient priestess of Isis.
‘Allan and the Ice-gods’ – Allan feels awkward toward Lady Luna Ragnall after their recent taduki-induced vision in The Ancient Allan, in which they were nearly married, and he refuses three invitations from her to return for another vision and has vowed never to use the drug again. Few weeks later Allan has a psychic experience and later learns that Lady Ragnall had died of heart failure in the Temple of Isis. Allan inherits her estate and distributes it to charities except for a box containing the taduki drug which Lady Ragnall had left him. Captain John Good shows up and persuades Allan to use the drug and the two enter into their vision.

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