Hearing loss is a serious impairment that hinders proper communication and social integration. Language deprivation leads to frustration and isolation that result in negative cognitive, emotional, social and psychological consequences. The study elucidates the definitions of metacognition and highlights its functions. It discusses the differences between metacognition on the one hand, and cognition and theory- of- the mind on the other hand. Moreover, it expounds how deafness hampers sending and receiving information and consequently hinders almost all cognitive skills. The study reveals the sufferings of the main characters of Sara Novic's True Biz (2022) and concentrates on their retarded cognitive abilities as a result of their deafness. Being a deaf herself, Novic managed to depict thoroughly the world of the Deaf. Furthermore, she also collaborates with a deaf talented artist, Brittany Castle to illustrate the novel with many symbols of the American Sign Language (ASL). In addition, Novic highlights the burdens of the families of the Deaf, the rigidity of the political and educational systems, the shortcomings of the medical devices and rehabilitation methods available to them.