Sister Caravaggio by Maeve Binchy

When a priceless Caravaggio mysteriously disappears from a convent in rural Ireland, it seems like the last straw for the little community. With no witnesses and no CCTV footage, the masterpiece is feared lost forever and the nuns, who depend on ticket sales to curious tourists, will have to sell up and leave. But the indomitable Sister Alice persuades Sister Superior to allow her investigate. With the help of the abbey's computer-savvy librarian, Sister Mary Magdalene, the two nuns swap their habits for short skirts and set out into the criminal underworld to track down the painting. As the list of possible suspects - and the body count - rises, the sisterhood sleuths realize that the nearer they get to the Caravaggio, the more their lives are at risk.