White, N: Famished Heart: The Sunday Times Crime Club Star Pick (The Vincent Swan Mysteries by Nicola White (Viper Books))

Her head was bowed, and the hands braced on the chair arms were not like hands at all, but the dry dark claws of a bird...The Macnamara sisters hadn't been seen for months before anyone noticed. It was Father Timoney who finally broke down the door, who saw what had become of them. Berenice was sitting in her armchair, surrounded by religious tracts. Rosaleen had crawled under her own bed, her face frozen in terror. Both had starved themselves to death. Francesca Macnamara returns to Dublin after decades in the US, to find her family in ruins. Meanwhile, Detectives Vincent Swan and Gina Considine are convinced that there is more to the deaths than suicide. Because what little evidence there is, shows that someone was watching the sisters die...