The Forgotten (Baldacci novel)

He suspects that she was murdered and begins an investigation into her death, aided by his old friend Julie Carson and a local officer named Cheryl Landry.

Throughout Puller's investigation, he crosses paths with Mecho multiple times, who helps him fight off various goons who attack him.

After Puller and Julie run into Mecho and Chrissy, the latter reveals herself as a Colombian agent named Claudia Diaz.

The plan goes well until several of Lampert's goons attack, killing Diaz and wounding Julie.

Afterwards, Puller and Julie return home, where he reports back to his amnesiac father.