Magic Study (Study #2) by Maria V. Snyder
Available at: Amazon / Barnes & Noble
In this book, she encounters more troubles and embarks on more exciting adventures in an attempt to prove that she is not a spy from Ixia and also to capture an inhumane murderer who has killed eleven girls in his quest to gain strong, unbeatable magic power.
This is another one of Maria V. Snyder's books that I highly recommend. But make sure you read the first book before reading this one so that you have a better understanding of Yelena's journey.
Note: The author slightly mentioned about a rape scene and one about Yelena sleeping together with Valek, but there are no detailed descriptions.
Read my review of Poison Study (Study #1) by Maria V. Snyder
Read my review of Fire Study (Study, #3) by Maria V. Snyder