The Hundredfold Billionaire

On his thirtieth birthday Grayson Locke is fired. The same day his wife Vanessa Brandt divorces him and he is put out of the house with nothing. Vanessa keeps the house and their son and goes to Trevor Voss, who worked at the same company as Grayson and stole his AI model. A voice then offers Grayson a deal: every dollar he spends comes back to him one hundred times over. He buys a mansion for 100 million dollars. His best friend gets a shopping mall worth 800 million dollars from him. Then 8 billion dollars goes into Zenith Group for a research laboratory, and that investment finishes Trevor. The people who dropped Grayson on his birthday now come to him asking for help.