House of Dark Shadows Via "The Vampire Omnibus"

Picked up this book called The Vampire Omnibus at some point after high school; rediscovered it recently and discovered that, thank you horror anthology guru Peter Haining, it includes a chapter called "Dark Shadows."  Though I think the book claims that the chapter is a selection from The Curse of Collinwood, it's actually an excerpt from Marilyn Ross's adaptation of House of Dark Shadows.  It seems like a strange selection; mostly lovey-dovey, focusing on Barnabas and Julia, who have a better relationship in the novelization than they do in the actual film, though, of course, it ends the same as all Barnabas/Julia film scenarios do:  strangulation and/or vampirization.