The preview added with Monster Blood is Back seems to set up things differently. The preview starts with a new protagonist, Todd Coates, who is visiting the farm of his Aunt Clara and Uncle Jake. He'll be visiting his cousins Mila and Skipper, and the book seems to be implying that they're already strange early on. Now, that's all there is, but no mention of a Scarlett Martenson, Owen, Ross or Annie. This could still be the final plot, but we'll have to see. I guess we'll get more of an answer when we get closer to July.