An eccentric investment banker resorts to a life of chance making all decisions based on the flip of a coin after losing billions for small investors, but when he descends heavily to a life of crime he must learn to trust his own judgement before he loses those he loves.

Thanks so much for your help, I love this suggestion.

How about something like:

Bitterly disillusioned after losing billions of dollars in the stock market with the computer trading algorithm he wrote, a math genius decides to live by the flip of a coin.

How about something like:

Bitterly disillusioned after losing billions of dollars in the stock market with the computer trading algorithm he wrote, a math genius decides to live by the flip of a coin.