Purple Hibiscus , her first novel , made the Orange Prize shortlist in 2004 , and because of the success of Half a Yellow Sun , critics have said that Adichie may have even more success in the future . Purple Hibiscus , her first novel , made the Orange Prize shortlist in 2004 , and because of the success of Half of a Yellow Sun , critics have commented that Adichie may be in the `` fast track '' for literary success .