The Clockwork Heart — Lilliana Rose

Haunted by a past lover and left with scars so deep Libby gave up her life as an explorer, she spends her days trying to avoid bad memories by training ruthlessly with Helen, the woman she hired to teach her self-defense. Helen is beautiful, appealing, and could be what Libby needs to climb out of her past once and for all.

Until the past returns and threatens to destroy Libby, and all that she holds dear, once and for all.