I’m confused - is this the first book in a series?

The blurb sounded promising, and I’m sad that I didn’t like the story as much as I thought I would. While I found the slow reveal of bits and pieces of Grace’s history intriguing (and terrifying), some things in the story didn’t add up for me. One of those (and this one’s a doozy) was Grace’s mom. I do not understand why she acted how she did, both in the past and in the present. Some events happened for no apparent (to me) reason while some questions never got resolved.

More often than not, at one point in the story, the title makes sense and things fall into place, but this didn’t happen for me (YMMV). Is this supposed to be the first book in a series and the open question will be answered later?