Demon King - Summoner Trilogy, #2

Can Cassandra prove Alexey's innocence in time and save his life? After being deceived and tricked by Ashmedai, Cassandra's had it with demons and their scheming. She refuses to be a pawn in their games any longer. It's high time she lived a normal life.  But then the Vampire Tribunal accuses Alexey-the vampire who helped her escape Ashmedai's clutches-of high treason. If found guilty, he'll die the Sun Death! Cassandra has no choice but to ask the newly crowned demon king Nysrogh for help.
After all, he is the demon Alexey supposedly summoned, an action that could now put him on death row. Only he can prove Alexey's innocence. When Nysrogh refuses to heed her call, she finds herself in a deadly race against the clock.