The 'Geisters was on the receiving end of a really kind--and dare I say smart--review in the National Post this weekend. Natalie Zina Waschots was by her own account quite terrified reading the book, writing among other things: "There is not a moment, until the final, world-crashing reveal, that is spared from a sense of creeping dread."
To see some of those other things she wrote, have a look here.
* * *
Update: Since posting this, the National Post has gone the way of a pay wall. Good thing the review got syndicated all across the country. At this writing, it's shown up in Saskatoon, Edmonton, Calgary, Montreal, Windsor... and in the Regina Leader Post, one of the few who didn't edit all the good parts out. Here's a link, paywall-free.
Natalie, meanwhile, has compiled all the links for all the iterations over at her blog. Right here.