Escape from the Shadows

Detective Ren Larsen has received a strange request from Carissa: Bring someone back from the afterlife. Bastian has been kidnapped by the shadows and taken to another world, and he must be returned as soon as possible or he will become a shadow forever.

The details are scarce, with only two clues to start: a cabin whose location is unknown and a place called Penumbra about which nothing is known. Will the detective be able to bring Bastian back to our world?