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As in individual treatments, the question of the ending of a group psychotherapy, especially in closed groups, is all the more acute because, due to the multiplicity of patients, group psychotherapy is not supposed to have the same effects for each of them. The authors get round this difficulty by analysing the quality of the group mechanisms based on the clinical material from the last sessions of a closed group of adolescents in difficulty. They show that, apart from the usual psychic mechanisms employed in response to a bereavement (individualization, introjection, negation, presence-absence, setting up of sub-groups…), the group, by regressing to the protomental state, revisits the birth of internal spaces and, through effects of transmodality, associates in various forms of expression, sensoriality, motricity, affects and representations. The authors feel that the quality and flexibility of this psychic work are good indicators of the end of treatment.