DEEP ROOTS is the sequel to Ruthanna Emrys' WINTER TIDE and THE LITANY OF EARTH. It is a story set in a "perspective flip" Cthulhu Mythos. The basic idea behind the Innsmouth Legacy is the Cthulhu Mythos is not actively hostile but simply different. The Deep Ones are just another race of human beings, the Mi-Go are busy-bodies who want to make humans better, the Yithians (actually the Yithians are much worse). It moves the setting from the realm of horror into that of science fiction.