Echoes of intelligence

When Voight built Intelligence, Alexa Blake was one of the first detectives he trusted enough to bring with him - the sharp, fearless narcotics officer who became Jay Halstead's partner and closest ally.

They were in sync, unstoppable, and maybe something more... until the day she vanished into a deep undercover assignment and Chicago learned how fast a ghost can disappear.

Years later, Lexi Blake is back - bruised, exhausted, and carrying secrets that didn't stay buried when she walked out of Intelligence. Secrets that followed her home.

She wants to see Voight.
She won't say why.
And Jay can't tell if he's looking at the partner he once trusted with his life... or the threat no one saw coming.

Some ghosts don't stay gone.
And some echoes return louder than ever.