In Philippa Pearce's "Tom's Midnight Garden," the protagonist, Tom, navigates a world of imagination and adventure. He discovers a magical garden that only appears at night, allowing him to connect with different times and characters. Tom's interactions challenge his perceptions and bring him a deeper understanding of life and time.

When Tom asserts, "I am not 'up to' anything, Cousin Edgar," he rejects the idea that he has ulterior motives. This statement reflects his innocence and desire for genuine experiences rather than deceit or cunning, emphasizing the theme of authenticity in relationships and the importance of honest intentions.