An attempt by Coulson to recruit some new Inhumans goes south when Lash turns up and kills them all. However, despite having to work with the ATCU and Rosalind Price (Constance Zimmer), our heroes manage to get a lead on the 'monster'.
Through a tracking virus that has infected certain Inhumans' personal computers, Coulson and co are led to Dwight Frye (Chad Lindberg), an IT expert working with Lash.
However, while Frye is being transported to the ATCU's holding facility, Lash attacks the armoured vehicle.
Meanwhile, Hunter's infiltration of Hydra reaches a head, when he is finally in a room with Ward, and Simmons' obsession with getting back to the alien planet where she was stranded comes to the fore.
With Devils You Know, Agents of S.H.I.E.L.D continues to advance its main plot at a snail's pace, achieving as much in three episodes as Agent Carter does in one.
Don't get me wrong, this was a good episode, just not inspired.
Given that it's set in a part of the Marvel Universe that is still discovering the existence of "superpowers", it somehow lacks the sense of wonder that you would expect - and hope for.
Even with the presence of Daisy and Lash, and a handful of other Inhumans, there is a rather sad mundanity to Agents Of S.H.I.E.L.D. almost as if all the cool stuff is happening off-camera, somewhere else.
There were some fine action sequences in Devils You Know, and some tantalisingly dangled plot hooks, but it's also a strange mix of surprisingly rushed sub-plots (such as Werner Von Strucker taking Dr Garner's class) and the painfully protracted.
The truly interesting stuff - such as Lash's identity and mission, and finding out what happened to Simmons - is being drip-fed amidst a waterfall of distraction.