What techniques did Anderson use to build reader suspense and engagement in this chapter ?

In the short term, however, Mattie has many challenges to confront when she and her grandfather return to Philadelphia. Albeit in different ways, the situation in the city is almost as precarious and dangerous as the situation when they were stranded in the countryside. Urban environments tend to be dependent on systems of commerce and supply to provide food and other necessary items, and once those systems break down, it can be very hard to get what one needs. Mattie once complained about doing basic chores at the coffeehouse, but she now has to take on responsibility and hard work to keep herself and her grandfather alive. Although she is afraid and nervous, Mattie further demonstrates her maturity by showing courage and optimism to her grandfather.