Ava Lin is in first grade, and she's really good at dancing, making up games, and finding treasure. This week she's super-duper excited, because it's going to be the BEST WEEK EVER. First, her popo--Chinese for grandmother--is coming to visit, and Ava can't wait to show off the special acorn, button, Post-it note, hair clip, and inside part of a marker that she found on the school playground. And second, this Sunday is the school walkathon. If Ava and her best friend, Kushi, manage to walk twenty-five laps, they will each earn a gold medal! But the week doesn't go exactly to plan--like when Popo mistakes Ava's treasures for trash, or when Ava discovers that fundraising for a walkathon is not quite as easy as she had hoped. Is there a way to make this week a super-duper happy one regardless?