"Among" or "Between"?

In most cases, use the preposition among when referring to three or more things and use between when referring to just two.

Both of the following sentences are correct:

• Among the residents of the city, there was universal agreement that Kristine was destined for success as both a librarian and an author.

• Just between you and me, this book should be on every writer's reading list.

By the way, among and between are prepositions, so their initial letters should be lowercased in titles.