This might be said to be the definitive work on bereavement, having been republished repeatedly since it was written in the early 1970s. It is essentially a scholarly work but, but is written in such a way as to be accessible to the educated member of the public - the empirical work is appendicised and the language kept jargon-free.
Parkes begins by explaining the fundamental psychological processes that underly bereavement in an account based upon Attachment Theory, arguing that bereavement represents the difficulties of the mind in adapting to a radical change in the psychosocial framework upon which it has hitherto worked. After this he looks in more detail at possible ways in which, and reasons that, the grieving process can go wrong - grief being repressed or continuing indefinitely - and ways in which psychologists and volunteers can help to avert this.
I cannot think of a great deal to say in evaluating this work: the account is extremely clear & detailed and is immaculately reseached, and one is left with the sense that not only does one have a comprehensive understanding of bereavement, but also an insight into the fundamental ways in which human attachments are both ruptured and formed. I recommend it highly to either the student of psychology or anyone with a personal interest in bereavement.