Q:I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Thumbelina Movie plot: A lonely old woman who longs for a child is given a seed by a good witch. When planted, the seed grows into a flower, and inside the blossom is a tiny girl the size of the old woman's thumb. The old woman names the girl Thumbelina and raises her as her own. Although Thumbelina loves her mother, she craves companionship from someone her own size. One night, Cornelius, the fairy prince, stumbles upon Thumbelina after hearing her beautiful singing. The two take a ride on Cornelius' bumblebee, and fall in love; during this ride Mrs. Toad and her son Grundel are enchanted by Thumbelina's singing. Cornelius promises to return the next day, but after he's gone, Mrs. Toad kidnaps Thumbelina from her bed and takes her away. Thumbelina awakens on Mrs. Toad's show boat. Mrs. Toad wants Thumbelina to join their troupe and marry Grundel, who is in love with her. They leave Thumbelina alone on a lily pad in order to fetch a priest, but a friendly swallow, Jacquimo (the narrator of the film), overhears Thumbelina's cries for help and frees her. Jacquimo's friends, the jitterbugs, promise to help Thumbelina get home safely while Jacquimo sets off to find Cornelius. Meanwhile, Cornelius learns of Thumbelina's kidnapping and ventures out to find her. While trying to get home, Thumbelina is ambushed by Berkeley Beetle, who scares the jitterbugs away. He is enamoured with her singing, and promises to show her the way home if she sings at his Beetle Ball first. Thumbelina agrees, but when she's received poorly at the Beetle Ball, Beetle kicks her out without helping her. Winter is approaching. Jacquimo accidentally impales his wing on a thorn and is knocked out by the cold, while Cornelius falls into a lake and is frozen in ice. Grundel, who is searching for Thumbelina, finds Beetle and discovers she is in love with Prince Cornelius and upon some convincing from Beetle, decides to find and kidnap Cornelius to lure Thumbelina to him. Grundel forces Beetle to help him as Grundel steals his wings and won't return them until Beetle... My question: Who discovers Mona's wicked plan?
A:
Thumbelina