While Adelle DeWitt was occupied with finding Echo and Paul Ballard, there’s one Active she may have forgotten. He caused a little trouble, like killing several Actives and severely injuring another, all to get the love of a certain girl…named Echo.

Now, Alpha is back, and he’ll win Echo’s love by eliminating the competition.
 

There’s nothing more troubling than a missing Active.

Adelle DeWitt has been busy trying to find Echo, who has gone off the grid thanks to having removed her GPS chip in "The Left Hand".

Her bosses are not happy. They decide to make some changes, while Echo is busy with another MIA employee trying to battle prison abuse in Texas.

In the end, Adelle DeWitt will make a choice that will not be popular, but keeps her alive…which is what matters to her.

It’s ironic that CSI’s theme song is "Who Are You" by The Who, because that would be a more appropriate theme song for this episode, "The Left Hand". Here, two Dolls try to asset their true selves, a woman will get betrayed, Satan shows up, and two computer geniuses make small talk while planning betrayals. We also see more proof that Enver Gjokaj is the best unknown acting genius in Hollywood who should be well-known as soon as possible.