His Tormented Heart (Island of Ys #3)
Katee Robert
Delilah's attraction to Ryu makes no sense, and she would have been happy to ignore it if not for the threats she's received. Threats against her little sister. Threats to hurt her if Delilah isn't able to find out more information on the Horsemen.
Ryu and Delilah don't trust each other--and with good reason--but they can't deny the chemistry that sparks to life every time they touch. As they grow closer and closer, so does the danger to Delilah's sister...and to the Horsemen.