The Donzerly Light — Ryne Douglas Pearson

With a destitute childhood and the tragic loss of his parents a distant but constant memory, Jay Grady has come to Wall Street to make a name, and a fortune, for himself. But the success he'd imagined is frustratingly elusive.

Until he meets the bum. An enigmatic transient who occupies a Manhattan corner, offering puzzling morsels of wisdom on a sign he changes daily. Drawn to the bum one day by a familiar snippet on his sign, Jay gives the man some spare change.

What he gets in return shakes him to his core.

Suddenly gifted with some power of prescience, Jay becomes the darling of Wall Street, picking winning stocks as if he can glimpse the future.

Or shape it.

But the dark side of this gift reveals itself as a curse when Jay tries to turn away from what he's been given, leading the bum to reach into his life with murderous results. Running from the horrific reality that his power now unleashes, Jay finds his flight coming full circle as he must face the man, the thing, that set him on this path.