This book offers an insight into some of the central topics in the current panorama of metaphysics. Thorny issues, such as the ontological state of fictional entities, abstract objects, and possible and impossible worlds, are addressed through an open conversation with Amie Thomasson, one of the leading figures in the current scene and landscape of metaphysics. This collection of heterogeneous and critical essays on her work, and her replies to them, stem from the SIUCC (Seminario Interuniversitario de Ciencia Cognitiva/Inter-University 3-day Workshop on Philosophy and Cognitive Science). By means of this interaction between a group of top scholars and Amie Thomasson, the book introduces the philosophically curious to the way the "first philosophy" is carried out today. This volume is of great interest to academics, philosophy majors who are taking an upper-division metaphysics class, and members of the general public who are curious about the work of Amie Thomasson.