When an innocent female assassin is framed for the murder of her partner, she must evade the utopian society she protects long enough to convince an unbelieving man from a rival family to take over his rightful place as leader of the community, a feat that places her and the realm she protects at risk.

How can she be an "innocent female assassin?"

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When an assassin is framed for the murder of her partner, she risks the utopian society she protects to convince an unbelieving man from a rival family to take his rightful place as leader of the community, a feat that places her and the realm in jeopardy.

It's not clear what the causal relationship is; that is, how being framed for murder jeopardizes of the utopian community. Or why being framed compels her to nag the guy into acting like a mensch.

Also the plot seems to pivot on the guy, not the girl. She can only try to influence him; she can't MAKE him do what he needs to do. The biggest decision is his to make -- not hers. So who is the protagonist? And who is the antagonist, the common foe?

'innocent' and 'framed' are redundant ... as are 'convince' and 'unbelieving' ... as is 'over' and 'rightful'.
She has to evade the whole society? Seems a bit odd. As written achieving her goal puts her and the realm at risk. Seems like an unworthy goal. So maybe 'feat' is the wrong word.