So, what's The Devil's Muse about? Halo-8 provided this summary:
When beautiful young actress Lisa Small (Kristen Kerr of David Lynch's Inland Empire) is cast as the tragic victim known as The Black Dahlia in a film about Hollywood's most famous unsolved murder, an entire dreamworld awakens around her. Meanwhile, a local sociopath has set out on a copycat murder spree timed out with the 60th anniversary of the original killing. A spider's web grows around Lisa as her nightmares and desires intersect with the death toll rising around her.