"Dr. Adriaan" by Louis Couperus is the fourth and last of the volumes forming The Books of the Small Souls series. In it, the reader renews his acquaintance with all the characters that survive from Small Souls, The Later Life and The Twilight of the Souls. This book, though part of a series, can be read as a standalone as readers find themselves sucked into a world where regular, everyday people, find adventures in the mundane parts of life.