"I am seeking representation for my novel, a completed Non-Fiction Romantic Crime Drama."
Even if your novel observes the laws of gravity, and respects the laws of physics you do not ever say your novel is non-fiction. Many things in a novel may be true. That does not make it non-fiction.
A "non-fiction novel" is narrative non-fiction. You'll see "non-fiction novel" used to describe early works in this category; IN COLD BLOOD is a classic example.
But now, and forever onward, here's the rule:
1. Novels are fiction by definition. (no fiction novels much like there is no presidential president)
2. Non-fiction with a narrative arc, and a riproaring good story is "narrative non-fiction."
3. If you don't observe this rule, I will arrange for my non-fictional flying monkeys to visit you.