Ex-NSA cryptanalyst Polly Linson spots a hidden Fibonacci sequence in an Austin music blog. When the blogger turns up dead with numbers tattooed on his corpse, she's pulled into a deadly pattern of murders across the city's music venues.
Racing against time with Detective Kelly Medina and hacker Taylor Cardillo, Polly must decode a mathematical cipher pointing to a catastrophic attack at SXSW. But the sequence connects to Project Cassandra, a classified NSA program she helped develop that weaponizes sound itself.
As the festival countdown ticks toward zero, Polly realizes someone from her past is sending her a message written in bodies. To stop them, she'll have to face the secrets that drove her from the agency and solve a puzzle where every wrong answer costs another life.
A pulse-pounding techno-thriller where cryptography meets murder in the heart of Austin's music scene. The pattern has been set. The countdown has begun. And some sequences, once started, can never be stopped.
