Maisie asks her friend Teddy to be her pretend boyfriend on a visit to her parents. But she realizes there are some important things she doesn't know about Teddy, and the day takes a turn that neither of them expected.
Teddy's comment about the stairs comes directly from my experience with many sets of shallow stairs when I was house hunting. There needs to be some sort of standardized step depth, because way too many stair steps are crazy shallow!