False witness : a Sister Agatha mystery
(Book)

Agatha is an extern-authorized to interact with the outside world-for Our Lady of Hope Monastery, a small community on the cusp of financial ruin. When a drunk driver crashes his SUV into its security gate, the nuns must scramble to find the funds for repairs. Meanwhile, a hacker is disrupting the computer work the community relies upon for much of its income, and the adjacent vineyard may be sold to a developer. Salvation seems at hand when dying millionaire John Guttierez, aware of Agatha's reputation as an amateur investigator, offers her a lucrative payday if she succeeds in tracing his estranged niece.