Among those who experience a sudden and violent loss of a loved one, as many as 40 percent may struggle with Prolonged Grief Disorder (PGD). To help clinicians understand and treat those suffering from this crippling condition - which is much longer-lasting and all-consuming compared to typical bereavement - experts from the Uniformed Services University (USU) have collaboratively published a new book, Grief and Prolonged Grief Disorder.