Readers across the world are in love with author Sally Carmichael's series of romance novels that chronicle the epic love story between a human girl and a merman. But no one knows that Sally Carmichael is really Simon Hayes, a bitter, serious novelist - and Simon would like to keep it that way. When he is forced to meet a movie star about the movie adaptation, his life of anonymity starts to crumble.

It's almost graduation day for high school seniors Troy, Gabriella, Sharpay, Chad, Ryan and Taylor — and the thought of heading off in separate directions after leaving East High has these Wildcats thinking they need to do something they'll remember forever. Together with the rest of the Wildcats, they stage a spring musical reflecting their hopes and fears about the future and their unforgettable experiences growing up together. Will their final show break them apart or bring them together for the greatest moment in Wildcat history?