There is "Mary Reilly" in the movies starring Julia Roberts. Its preface says ───
"We are somewhere in England in the 19th century. A Pretty housemaid works in a nice house, which is Dr. Jekyll's house. Mary Reilly think she found her best job, because she is poor and the doctor is well-known and rich. The film tells the 'Dr. Jekyll and Mr. Hyde' story as a woman sees the two men, one of them is good and the other is evil. And she loves them ..."
The third sentence starts with "Mary Reilly think". I saw the preface in a lot of web pages and in all of them it says "Mary Reilly think", not "Mary Reilly thinks". Why is "think" used here, not "thinks"? She thinks she found her best job, but actually it isn't her best job. So is "(should) think" used? Would you please tell me why?