Despite being relatively torn on this one, im going to go with a four, in part because I didnt expect to enjoy it. Also, because it's actually kinda different, as it steps into a relatively new arena for novels, making visual content just as important to the story as the text. The images which accompany the storytelling are arresting and fascinating, making me wish for a coffee-table sized print copy over my ereader, in order to enjoy them the better. 
 We start off with out teenage hero (Yes, this is a YA classified book) being told all kinds of funky stories by his grandfather, who soon after dies, putting our young hero into the position so many YA and children's novels do... the unparented, misunderstood child. (view spoiler)[ Grandfather's death makes our lad believe that yes, all of those stories are actually true, and surprise, surprise, everyone figures he's slipped the rails. And of course in the end he turns out to be right, they are true, monsters are real, and Alice is never getting back to her side of the Looking Glass. (hide spoiler)] 
 Riggs is exploring the theme of over-protection and the harm it can do, which is rather nice to see happening in YA literature at a time when Helicopter Parenting seems to be considered the norm. Our young hero is sheltered from the truth and so is unprepared to a dangerous degree when reality bites him in the ass. It's well written, it's got a great pace and the dialog is realistic from both the sulky you-didn't-believe-me attitude from our teen to the "we're-just-trying-to-help" condescension that so most adults don't like to think exists. 
 Overall, I recommend this one, and can only hope that if there is a sequel (as is implied by the ending) that Riggs manages to live up to an auspicious beginning.