Final answer:
Polly and Digory's curiosity in 'The Magician's Nephew' leads to trouble when they awaken an ancient evil and bring it back to London, facing moral dilemmas thereafter.
Step-by-step explanation:
In The Magician's Nephew, Polly and Digory's curiosity leads them into trouble when they explore places unknown and meddle with things they do not understand. Their desire for adventure and discovery inadvertently causes them to awaken an ancient evil and transport it back to London. Throughout their journey, they encounter various challenges and moral dilemmas that stem from their initial curiosity and the reckless decisions that follow.