One problem I had when deciding which Shakespeare play to start reading through was that I didn't know what most of the plays were about! I had studied MacBeth and King Lear in high school, but I didn't think the girls would enjoy them first up.
I found this lovely book on Trademe a few months ago, and I'm so glad I did. It has short summaries on every one of Shakespeare's plays, all written by Marchette Chute. The summaries are all around 10-12 pages in length, some shorter, so they are quickly read. Published first in 1960, my edition was published in 1979 and features a lovely dustjacket with illustrations of some of the characters from the plays.