(from ebookjapan):
Dow is Dou for "without a name" and Dou for "the same." The Dow Detective Agency, which has an office in Shinjuku, is a strange family-run detective agency with a wheelchair-bound director, Dou Mumyo, his son, Gen, and daughter, An. One day, a woman named Ayako Nekogami shows up on a case. They want to investigate a series of ominous events, thinking that they might be the curse of the Inugami family, but by the time Gen and Yami head for a village deep in the mountains the next day, it is already too late! A mystery suspense featuring a mysterious detective!