Repetition, Anyone?

The characters are stuck in a time loop, perhaps an Essene is holding them there until they fix something for them, or maybe they unwittingly messed with a Dark Object that triggered a time vortex.  Only the Squad is aware of how the same day keeps repeating and they start off flabbergasted at what can be done to stop it.
Player's Adepts may die on this mission, but so long as at least one of them makes it till the end, when the time loop restarts, they are all alive again.