A high-stakes art thief.
(she mouths off a lot)
A reality show bounty hunter.
(he's kind of a sleaze)
The ghosts that live inside their heads.
(one good, one's evil)
An arcane machine hidden in the Paris catacombs.
(that's in France)
The secret organization that wants it.
(you in danger, girl)
The Ghost Engine is DOUBLE the buddy cop dysfunction, like you Inceptioned Tango and Cash into Lethal Weapon, but also The Frighteners and Dead Heat for some reason.