In "sonata for harp and bicycle" Jason decides to enter the building after 5 PM to find out why people must leave by that time each day. this part of the story occurs at which stage in a plot diagram

The stage in a plot diagram occours when they let the readers to know about the mistery about the building that no one can be there after 5PM and they must leave always at that time. So Jason (the protagonist) wonders why people can't be there so he makes a plan to enter the building after this time to discorver the mistery and this is the Rising Action of the story.