" We're looking at the wrong pattern," Charlie started.

" You've told us this, " Don interrupted, " Tell us what we're dealing with."

" I will. Unless you keep interrupting me," Charlie said irritated.

Don raised his hands up in mock defeat, but stayed quiet.

" Okay," Charlie continued, " We all know that Sam, our 'Hexagonal Killer' is a copycat."

There were nods among the agents.

" And scince are original killer struckonly after Sam and in a clearly different way, the only lead we've been able to use is the data from Sam's cases to figure out his pattern of attack."

" The data that was circulated to the media," Terry replied.

" Exactly," said Charlie, " That data, of course, consist mainly of letters Sam sent to the police stating how many he would kill."

" There was thirty in total, right?" David asked.

" Yes," Charlie nodded, " But he only got to six."

" Hence the name Hexagonal Killer," Don replied.

Charlie nodded. Plugging information into the computer he pulled up a map of the city with six blue points.

" The original mathematicians on this case were able to gather a ruff judgement of where he was going to strike next. The agents were lucky enough to find the exact location."

" Alright," Don said, " So how does this help us track down the original pattern?"

" Quite simply," Charlie answered, " We're not looking for a hexagon. We've been considering the wrong shape."

" Now wait a minute..." Don started, but Charlie was to fast for him. Plugging in more data to the computer, Charlie pulled up six red dots and orange lines connecting the blue.

" What's this?" Don said caught off guard.

" This," Charlie answered, " Is our original pattern. We're looking at a pentagon. A regular pentagon at that. Our killer finds his victims by translating, or moving, his pentagon in a certain direction."

Don stared at the screen for a few minutes.

" Charlie," he finally said, " Can you predict were he will strike?"

Charlie solemnly hit a key. Instantly hexagons appeared, covering the screen. Don stared in utter shock.

" I also have an address," Charlie said.

Don turned to look at him.

" How? Where?"

" Once the pattern was visible I just needed to create an equation that would..."

" Where, Charlie?"

" 922 Madison Drive."

" Great, Terry gather up the swat team meet me their," Don said getting down to business. Immediatly the rest of the agents ran to do their jobs. Charlie just stood, waiting for something to do.

" David," Don called as everyone else piled out, " Take Charlie home."

David nodded but Charlieprotested, " Don, wait a minute."

" Look, Charlie, we made a deal," Don said facing his brother, " You've done your part. Now go home and let me do mine."

Charlie nodded. Silently he let David lead him out of the room. As the elevator closed he got a fleeting glimpse of Don grabbing his gun.

" Here we are, Charlie," David said stopping in the driveway.

" Thanks," Charlie replied getting out.

" Charlie, wait," David called.

The younger Eppes sighed and leaned down to look in the car.

" Yeah," he answered.

" I just want to say thanks," David said, " We couldn't have solved this case without you."

" No problem," Charlie replied standing.

" One more thing."

" Hmmm."

" Don't be mad at Don. He was worried sick about you. It was the worst I've seen him."

Charlie looked at David. His face held an unreadable emotion as he processed what he just heard. Sighing he stood up and David watched him enter the house. Suddenly the racketing sound of gunfire could be heard. David stopped, Charlie!

Jumping out of the car, David drew his weapon and snuck towards the front door. Inching slowly he saw that it was open, but there was no blood.

Inside he heard a cruel, distinctly female voice, " You seem to have a way of ducking my bullets, Dr. Eppes. Though I'm sure your luck will change."

David risked a look into the room. Charlie lay crouch on the floor, his face away from David. From the way he was shaking David could guess his eyes were terrified. Looking up farther in the hallway he saw the elder Eppes kneeling gagged on the floor his eyes jumping from Charlie to the other occupant. Risking even more David looked deeper in the hallway and saw a beautiful, thin woman pointing a gun at Charlie.

In the next instant someone crept up behind David. A loud thunk could be heard and David's vision swam. He collapsed to the ground in a heap.