pot‧boil‧er /ˈpɒtˌbɔɪlə $ ˈpɑːtˌbɔɪlər/ noun [countable]
a book or film that is produced quickly to make money and which is not of very high quality, especially one that is exciting or romantic

[TahlilGaran] Dictionary of Contemporary English ▲

potboiler
n. A book, play, or film written for the primary purpose of earning money for the author.
"Reading a cheap potboiler helps me go to sleep," the professor wryly remarked.

[TahlilGaran] English Idioms Dictionary ▲