My first book

so, i just finished reading the grownup by Gillian Flynn ( pdf ) as my first book

the first line hooked me up and then i finished it in 2 days, its only 30 page book

i like the psychological horror element in the book , although the ending feels incomplete

now i want to build reading habit , so please suggest me short book and like the grownup , who will hook my attention and made me to finished the book

thank you