It looks generic to me, and a bit unclear, as in who the lizard man is estranged from? From Cali? What is her haunting past? What catastrophe threatens her world? Is there a conflict between her people and the lizardmen? Is she a lizardperson herself?
I would suggest rearranging it and filling in a few details like this:
When a bitter, lonely Cali takes in a lizard man, her (insert details of her past) comes to haunt her. But unless she (overcomes what from her past? or does what with the lizard man?) she will not be able to (do what?) to avert (what?) threatening to whip out the lizardfolk(?) or everyone(?)