Stolen (Otherworld)

Elena Michaels is back - and she has company. Lending a mission of vampires, demons, shamans, and witches, Elena is lured into the net of ruthless Internet billionaire Tyrone Winsloe, who is well on his way to amassing a private collection of supernaturals. He plans to harness their powers for himself - even if it means killing them. For Elena, kidnapped and imprisoned deep underground, unable to tell her friends from her enemies, choosing the right allies is a matter of life and death.