Nun in the Closet by Joanna Michaels

Vows of poverty and chastity shattered by murder?
Anne Hollis, the beautiful owner of a women's bar, has been charged with manslaughter in the death of a nun. Anne insists she is innocent - run off the road by another car - and appeals to probation officer Callie Sinclair for help.
The case gets interesting when yet another nun is murdered and Callie discovers that sex and money are involved.
And she and Anne find themselves falling in love, a situation dangerous to them both as they close in on the killer.