An undercover FBI agent struggles to take down a murderous robbery ring.

A retired Green Beret might be her best chance.

John Tyler is browsing in a jewelry shop when thieves descend on the place. Unarmed, he gets three people to safety... but not before the criminals kill the fourth.

The crew's driver, undercover fed Hope Raines, recognizes Tyler. He's crossed the FBI before, and she knows what he's capable of.

He might just be her salvation.

Stuck in a bad assignment, Hope reaches out to Tyler. He's in. The two must be careful, however, to avoid alerting the gang and their mysterious, elusive leader.

When the crew turns on Hope, it's up to Tyler to save them both. And he's going to push the criminals right to the redline and beyond.

Redline is the 8th high octane action thriller in the John Tyler series.