Having read the Study series, I decided to give Storm Glass a go. I think that it really helps to have read the Study series beforehand as the it gives you a bit more of an insight on who Opal is as well as the difference between Sitia and Ixia. 
 Opal Cowan is a glass magician, if that's what you want to call her. Truth be told, she can trap magic inside glass and well, it's precisely why she's been sent on a mission to the Stormdance clan--to try and help them fix the orbs they use to contain storm energy. 
 There is a lot of traveling and perhaps not as much character development as I would've liked, but otherwise it was enjoyable and the ending definitely leaves me wanting to snap up Sea Glass.