Here's a breakdown:
* Claudia's Curiosity: Claudia is deeply curious about art and history, and this curiosity is the driving force behind her plan to run away. She's fascinated by the mystery surrounding Mrs. Basil E. Frankweiler and her art collection, and she's determined to uncover the truth.
* Claudia's Frustration: Claudia feels stifled by her life at home. She's bored with school, annoyed by her brother Jamie's antics, and longs for more freedom and adventure. Her escape is a way to rebel against the monotony of her daily routine.
* Jamie's Reluctance: Jamie is initially reluctant to join Claudia, but he ultimately gives in to her persuasive arguments. He's more practical than Claudia and less adventurous, but he enjoys the challenge of escaping and taking care of himself.
The book opens with Claudia's audacious plan to run away and "live in a museum," which hints at a sense of adventure and a desire for a more exciting life. Her attitude is a reflection of her desire for independence and the freedom to explore her own interests.
Overall, the attitude at the beginning is energetic, hopeful, and filled with a sense of possibility. The kids are ready for adventure, even if they don't yet know what that adventure will hold.