Em straight to G7 ought to work.
If you want something longer and more traditional (more functionally convincing) go through the 5ths:
Em7-Am7-Dm7-G7 - those are all diatonic to C, but it would also work with A7 and/or D7 in place of the min7s.
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"There is a crack in everything. That's how the light gets in." - Leonard Cohen.
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