The Observer view: only a robust inquiry will hold NHS to account over Lucy Letby murders | Observer editorial

Families need answers from the trust that allowed preventable deaths to happenThe murder of premature babies in their first few weeks of life by a medical professional is impossible to make sense of. But this is the crime of which Lucy Letby, a nurse in the neonatal unit at the Countess of Chester hospital, was last week convicted in relation to a number of vulnerable infants entrusted to her care. They were utterly dependent on the clinical staff in that unit. But Letby murdered seven babies, a