Ted Hughes's Birthday Letters are addressed with just two exceptions to Sylvia Plath the American poet to whom he was married They were written over a period of more than twenty-five years the first a few years after her suicide in 1963 & represent Ted Hughes's only account of his relationship with Plath & of the psychological drama that led both to the writing of her greatest poems & to her death The book became an instant bestseller on its publication in 1998 & won the Forward Prize for Poetry in the same year ' To read Birthday Letters is to experience the psychic equivalent of the bends It takes you down to levels of pressure where the undertruths of sadness & endurance leave you gasping' Seamus Heaney ' Even if it were possible to set aside its biographical value its linguistic technical & imaginative feats would guarantee its future Hughes is one of the most important poets of the century & this is his greatest book' Andrew Motion