Hey, what's on the shelf? Sacred Hearts by Sarah Dunant

From Amazon.ca:

1570 in the Italian city of Ferrara, and the convent of Santa Caterina is filled with noble women who are married to Christ because many cannot find husbands outside. Enter sixteen-year-old Serafina, ripped by her family from an illicit love affair, howling with rage and hormones and determined to escape. While on the other side of the great walls, counter-reformation forces in the Church are pushing for change, inside, Serafina's spirit and defiance ignite a fire that threatens to engulf the whole convent.

SACRED HEARTS is a novel about power, creativity and passion - both of the body and of the soul. Hidden history brought alive by a wonderful storyteller, renowned for her Italian Renaissance novels.

I like Sarah Dunant's work normally, but from the back of the jacket I thought this was going to be about Serafina, although she actually plays more of a supporting role to Zuana, another sister in the convent. Serafina comes in screaming her head off because she's unwilling to become a bride of Christ since she has a lover on the outside.

I thought a lot of the situations weren't very plausible, and the plot moved at a bit of a snail's pace for me.