Face of Fury by Blake Pierce

FBI Special Agent Zoe Prime suffers from a rare condition which also gives her a unique talent: she views the world through a lens of numbers. The numbers torment her, make her unable to relate to people, and give her a failed romantic life. Yet they also allow her to see patterns that no other FBI agent can.

In FACE OF FURY, women are turning up dead, victims of a serial killer who carves a mysterious symbol on their bodies. The symbol holds some mathematical significance, and Zoe struggles to know if he is killing in the order of PI.

But when her theory falls apart, Zoe must second guess everything she thought she knew.
Has Zoe’s talent met its match? And can she save the next victim in time?