From the introduction:
A therapist welcomes a group of depressed sheep for a therapy in 10 sessions.
All the patients most specifically suffer from emotional blunting; they cannot express their emotions, and they cannot remember how it all started.
The group therapy is a collective exercise that will help the sheep recovering the traumatic memory each of them has been repressing for so long.
But in the herd, among the desperate patients, a wolf hides under a sheepskin, with the purpose of sabotaging their recovery...