Waggoner, Tim - The Last Mile

Following the Arrival, Earth is decimated; population mostly, I suppose, eaten.
Unseen rulers came from beyond and are called Masters.
Their go-to human servants are branded and called Thralls.
Everyone else is destined to be an unhappy meal, sooner or later.
Dan is a Thrall, driving down a broken highway with tied-up Alice in his backseat.
Destination? “Here’s yer pizza, boss!”
I have a suspicion Waggoner simply arranged bits from his idea journal, but this is stitched with a twist.
As with other books I’ve read by this author, there is a misogynistic component that may disturb some.
Never could decide whether the arrivals were SciFi aliens or Lovecraftian entities.