Detective Debra Collins finished off her career on a high, bringing in a pedophile before he killed his thirteenth victim. With only a couple of months to go until retirement, her captain tasked her with closing out a few cold cases.

It's never that easy, though. One of the cases has markers extremely similar to a murder a colleague (hunky Detective Hastings) has caught.

A bit more digging and Collins finds half a dozen more cold cases, all linked with similar wounds and victimology. Every one of them was a felon released on a technicality after a slam-dunk, by-the-book arrest.

While the task force works the serial case, Collins learns that the pedophile has been released on prosecutorial screw-ups. A few days later he's shot dead behind a pool hall.

Now the serial cases is personal and she's involved.

How did a serial killer survive, right under the cops' noses, for over thirty years?

Who's the secretive person from her future?

Who killed the pedophile?

How are these cases related to Collins, and why is she now the target of the investigation?

How does Time Travel really work, and what does it have to do with the killings?