Dark Glass by Orlando A Sanchez

Sometimes, being immortal can get you killed. 
When Fate pays Simon a visit accusing him of disrupting causality, she makes him an offer he can't refuse-become mortal or die.
There's only one small problem.
In order to become mortal, Simon must find the goddess, Kali the Destroyer, and convince her to remove her curse. To complicate matters further, Haven and Roxanne are under attack by an ancient spell-an entropic sphere designed to kill everyone inside the facility.
Now, Monty and Simon must find out why Simon is disrupting causality, stop a lethal sphere from killing innocents, and convince an angry goddess to lift a curse.
A typical day in the Montague and Strong Detective Agency. 
Join the Trio of Terror as they discover that not everything is as it seems, and sometimes, the past can kill you.

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