Short novels are called novellas. If you don't want to write a novel, but have more to say than a short story, you could try writing a novella.

You've surely heard of plays, poems, short stories, and novels. But novellas? They're not as well known, but pretty simple: nothing more than short novels. Sometimes novellas are called novelettes, but whatever you call them, you'll probably read a few in English class. Sometimes it's easier to squeeze in a novella than a whole novel, so maybe you could start with Joseph Conrad's "Heart of Darkness" or Franz Kafka's "Metamorphosis."

Definitions of novella
  1. noun
    a short novel
    synonyms: novelette
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    type of:
    an extended fictional work in prose; usually in the form of a story
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