But the studio is pointing to her own statements downplaying similarities between the blockbuster and one of her novels.
Gerritsen sued Warner Bros Entertainment in a Los Angeles federal court on Tuesday, alleging the studio violated an agreement she had with one of its subsidiaries to turn her novel into a movie.
She sold the film rights to the Gravity novel in 1999.
Warner Bros declined to comment on the case, but spokesman Paul McGuire noted that in October Gerritsen told an audience at an Indiana public library that the film wasn’t based on her book.
Gerritson’s lawsuit states that she believes Gravity director Alfonso Cuaron was attached to adapt the book into a screenplay without her knowledge years before the movie was made.
The lawsuit states the author added elements to a screenplay she wrote to try to get her book on the big screen.
The lawsuit alleges that Warner Bros breached Gerritsen’s contract for the film rights and profits.