Fallen Angel by Chris Brookmyre
To new nanny Amanda, the Temple family seem to have it all: the former actress; the famous professor; their three successful grown-up children. But like any family, beneath the smiles and hugs there lurks far darker emotions.
Sixteen years earlier, little Niamh Temple died while they were on holiday in Portugal. Now, as Amanda joins the family for a reunion at their seaside villa, she begins to suspect one of them might be hiding something terrible…
And suspicion is a dangerous thing.