Back in 1999 some people got really worried because there was talk about a possible problem with all the computers relating to going from 1999 to 2000. They felt chaos, horror and violence were sure to happen.
It didn't, of course. This book uses that perceived problem as a jumping off point for some short stories about Sabrina and a related problem. The clock that keeps track of magic is going to fail soon. The adults decide to hold a series of meetings to figure out what to do.
Sabrina, on the other hand, being a teenager, figures out she needs to do something so each story has her working to get pieces necessary to build a new clock.
All of the short stories are good and one is great. They cover things like Sabrina meeting Queen Elizabeth I, Woodstock, people involved in the American Revolution, Houdini, Frank L. Baum (The Oz books), various actors and actresses, Shakespeare, Vikings and others.
The best story revolves her being in Hollywood in 1944. She becomes involved in a movie that is directed by Alfred Hitchcock and has Ingrid Bergman and Humphrey Bogart in it! That story is extremely well written and good throughout.
I consider this a must book for those who like Sabrina the Teenage Witch books.