Si Spurrier 
Numbercruncher #2 [PDF ebook] 

Nothing worse’n a Mathematician in love. As he died in 1969, a Mathematician glimpsed the equation that drives the universe. This allowed him to strike a deal with the Divine Calculator: to be reincarnated – with all of his memories intact – for another chance with the woman he loves. In exchange, when he dies for a second time he’ll go straight into the workforce of the Afterlife, setting free another operative – a surly chap in a bowler hat by the name of Bastard Zane.

But the Divine Calculator has a horrible sense of humor, and he’s incarnated the Mathematician 30 years after his death, in a poverty pit on the other side of the planet. The Mathematician still has a plan to spin things in his favour… but Zane isn’t taking any chances with his cosmic get-out clause. After all, they don’t call him Bastard for nothing!