The CSIs investigate the death of Henry Duncan when his body washes ashore after being gored by a speeding boat. The boat, stolen from its owner, is found with traces of car oil. Duncan, an accountant, was a do-gooder and was about to expose improper business practices going on within his company and a home builder. On his way to work Duncan noticed a young boy in distress, follows him, and sees him get into a car with a tatted guy. However, Duncan gets cut off by a truck driver going the opposite direction. It turns out the kid was being used as a drug mule. Henry calls 9-1-1 to report what looks like the abduction of the kid and then calls the call center listed on the back of the truck to report the bad driving. It turns out the truck driver was fired as a result of Henry's call. In revenge, the driver stole the boat and killed Henry.

When a rabid dog kills a janitor at a renowned tennis academy, it's clear someone engineered the attack to target Coach Larry Hopper, Miami's most popular tennis coach. The team discovers Hopper was involved in a child sexual abuse case ten years prior, but settled out of court. Could the victim now be back for revenge? Calleigh learns that Austin North is a student at the academy and grows suspicious when pro player and academy alumnus, Jack Brody, takes a special interest in him. Forensics prove that Brody orchestrated the attack, and he eventually confesses to sending in the wild dog in an attempt to prevent Hopper from molesting Austin next. It's also discovered that the janitor knew that Hopper was assaulting young boys but chose to look the other way.