The Accidental Queen by Kristen Painter

Sparrow "Ro" Meadowcroft is about to get the promotion she's always dreamed of - curator of the museum where she works. She loves old things and the history that surrounds them, so when a patron leaves some items to the museum, Ro is eager to dig in.

The sword in the stone that comes with those items is clearly a joke. A well-made but obvious replica meant to be a conversation starter. Why anyone would think that belonged in the museum is beyond her, but she can't resist taking a crack at it and finding out if she's the chosen one.

And as it turns out.she is.

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