Cornwall by Lee Thompson
What starts as a little escape trip from London (Sherlock City, since Benedict Cumberbatch), turns into the horrid discovery of a lifetime to hubby and wife.
I also appreciate that it is not another Lovecraftian copycat within which all are relatives to some supernatural species.
The format is flawless, and if there are any grammar issues, then I am too Non-Native-Speaker and too ill-educated to even notice a single one.
Writing style is fluent and believable. So are the characters (and doggies).
Thanks for sharing!