The ruby in the smoke

Sixteen-year-old Sally Lockhart is thrust into a dangerous world when a cryptic warning, left by her recently deceased father, leads to a man's death. She must navigate the treacherous streets of Victorian London to uncover the truth behind her father's demise, a journey that entangles her in a conspiracy involving the opium trade and a priceless stolen ruby. Sally discovers she is central to these mysteries, and her life depends on understanding why.