In constructing the plot of my brothers keeper what literary technique did jay bennett use

the author jay bennett used flashback when she kept referencing the car accident with jamie

the anwser is went creeping down the river again, across the wide lonely marshes to the sea.

i longed to go with them out into the world to seek my fortune in foreign lands—africa, india, china and peru!

and, dreaming of the lands i had never seen, i'd sit on there, watching till they were out of sight.