 A companion book, Dark Angel: The Eyes Only Dossier, was also published in 2003. It is attributed to Logan Cale and was supposedly compiled by D. A. Stern. The book begins with a letter written by Logan during the stand-off at Terminal City. It is addressed to Detective Matt Sung, a recurring character from the series who aides Logan, instructing him that the package he is sending him contains documents pertaining to the four most critical Eyes Only investigations. In the event that Logan is killed by the potential invasion of Terminal City, he wants Sung to carry on the investigations. The rest of the book contains said documents relating to the four investigations.
