The Book of Shadows (The Graveborn Series #2) by RG Wesley:
 
Seph Hart has lost everything. Heartbroken and stranded in a strange land with her friend Simon, she has no home to go back to, and enemies still hunting her. But Seph has one mission—rescue Alex, the man she loves, and defeat the demon prince who took him. As she and Simon travel the worlds in search of Alex, they encounter a complex web of foes and unexpected allies, each with their own agendas and secrets. Soon, Seph discovers that her quest is entangled with forces much greater and more sinister than she could have imagined The journey to save Alex may reveal more about her true strength—and her darkest fears—than she ever expected. Will Seph save the man she loves, or will her demons take her first?
 
The Book of Shadows is the second installment in The Graveborn Series, a contemporary/portal fantasy romance that explores love, betrayal, sacrifice, and how far one woman will go to claim her power.