unputdownable
adjective informal uk/ˌʌn.pʊtˈdaʊ.nə.bəl/ us/ˌʌn.pʊtˈdaʊ.nə.bəl/
（书）令人爱不释手的，令人不忍释卷的，引人入胜的
If a book is unputdownable, it is so exciting that you do not want to stop reading it.
"Was it a good read?" "Oh, totally unputdownable - I finished it in two days." “那本书好看吗？”“噢，简直让人爱不释手——我两天就看完了。”