Something Rotten is the fourth book in the Thursday Next series by Jasper Fforde. It continues the story some two years after the point where The Well of Lost Plots leaves off.

Something Rotten! is a musical comedy with a book by John O'Farrell and Karey Kirkpatrick and music and lyrics by Karey and Wayne Kirkpatrick. Set in 1595, the story follows the Bottom brothers, Nick and Nigel, who struggle to find success in the theatrical world, as they compete with the wild popularity of their contemporary William Shakespeare.