This book is the first booklength analysis of investor accountability under general and customary international law international human rights law international environmental law international humanitarian law as well as international investment law.International investment law is currently facing growing criticisms for its failure to address corruption abuse environmental damage and other forms of investor misconduct. Reform initiatives range from the rejection of international law as a governing regime for investors to the dramatic overhaul of investment treaties that supposedly enable investor overprotection to the creation of a multilateral international instrument that would enable the litigation of claims against errant businesses before an international tribunal. Whether these initiatives succeed in disciplining investors remains to be seen. What these initiatives undeniably show however is that change is warranted to counteract this lopsided investors international law.Each chapter in the book addresses a different and underexplored dimension of investor accountability thus offering a novel and consolidated study of international law. The book will be of immense assistance to legal practitioners academics and policy makers involved in the design drafting application and reform of various international instruments addressing investor accountability.