The problem of the disposal of toxic waste becomes real to Don, Charlie and the team when several children are injured after a sinkhole collapses underneath a school playground. Charlie attempts to help with the case, but faces opposition from his new boss.

Don, Charlie, and the team search for a polygamist who is on the run. The man is on the FBI's Ten Most Wanted List for rape and murder.

After an extremely expensive yacht sinks in the middle of a race, Charlie is put between a rock and a hard place when Don and the NSA need his help on the case.

When two police officers are killed while eating dinner out, Charlie tries to figure out where the killers will strike next. Don's superiors make him see the department shrink.

Don and the team reopen a cold case when a LAPD badge turns up at a construction site. When Charlie joins the investigation, they attempt to track down the owner of the badge, an officer who has been missing 17 years. Meanwhile, Alan is informed that he's being sued.

Several area murders seem to be tied to voter fraud. Don, Charlie, and the team must find the killers before they strike again.

When a jet crashes in the middle of a forest, Charlie suspects that there is more to the crash than what meets the eye.

When Don investigates a series of bombings, he calls in Charlie to help pinpoint the bomber. But the two disagree over who the culprit is. Is it a new terrorist, or an old enemy?

When a former mob hit man on death row suddenly has a change of heart and agrees to confess to his crimes, Don has an uneasy feeling about the whole affair.