The Abyssal Box

An artifact is stolen, and seemingly destroyed. That shouldn't be possible.
The taskforce hunt for the possibly destroyed artifact, and given the theft might have included inside help, they must also investigate the dangerous secret society with its fingers in everything.

In an increasingly compromised position, Cassie questions who she really is, and if she's still serving the law as part of the taskforce.

With potential enemies all around, was the artifact that lets the user adopt the identity of others really destroyed?