Brochure, with a polygonal, in particular a 12 - or 16 -, on the side of the envelope (1), in which a book block (23) is suspended, the cover (1) is constructed in two layers with an outer position of the cover sheets (11, 12; 15, 16) and an inner position of the cover sheets (13, 14; 17, 18) in each case from a flexible flat material and a two-layer cover spines (5) and wherein the two layers at least along a on or in addition to the cover spine (5) running track of glue (8) are connected to each other and the outer regions of the umschlägbätter (12, 14 or 16, 18) of the two layers along an axis parallel to the cover spine (5) extending folding edge (6, 7) for the formation of envelope fold (12, 14 or 16, 18) are folded over.
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