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〃This is the Fibonacci sequence；〃 she declared； nodding toward the piece of paper in Fache's hand。 〃A progression in which each term is equal to the sum of the two preceding terms。〃
Fache studied the numbers。 Each term was indeed the sum of the two previous； and yet Fache could not imagine what the relevance of all this was to Saunière's death。
〃Mathematician Leonardo Fibonacci created this succession of numbers in the thirteenth…century。 Obviously there can be no coincidence that all of the numbers Saunière wrote on the floor belong to Fibonacci's famous sequence。〃
Fache stared at the young woman for several moments。 〃Fine； if there is no coincidence； would you tell me why Jacques Saunière chose to do this。 What is he saying？ What does this mean？〃
She shrugged。 〃Absolutely nothing。 That's the point。 It's a simplistic cryptographic joke。 Like taking the words of a famous poem and shuffling them at random to see if anyone recognizes what all the words have in mon。〃
Fache took a menacing step forward； placing his face only inches from Sophie's。 〃I certainly hope you have a much more satisfying explanation than that。〃
Sophie's soft features grew surprisingly stern as she leaned in。 〃Captain； considering what you have at stake here tonight； I thought you might appreciate knowing that Jacques Saunière might be playing games with you。 Apparently not。 I'll inform the director of Cryptography you no longer need our services。〃
With that； she turned on her heel； and marched off the way she had e。
Stunned； Fache watched her disappear into the darkness。 Is she out of her mind？ Sophie Neveu had just redefined le suicide professionnel。
Fache turned to Langdon； who was still on the phone； looking more concerned than before； listening intently to his phone message。 The U。S。 Embassy。 Bezu Fache despised many things。。。 but few drew more wrath than the U。S。 Embassy。
Fache and the ambassador locked horns regularly over shared affairs of state—their most mon battleground being law enforcement for visiting Americans。 Almost daily； DCPJ arrested American exchange students in possession of drugs； U。S。 businessmen for soliciting underage Prostitutes； American tourists for shoplifting or destruction of property。 Legally； the U。S。 Embassy could intervene and extradite guilty citizens back to the United States； where they received nothing more than a slap on the wrist。
And the embassy invariably did just that。
L'émasculation de la Police Judiciaire； Fache called it。 Paris Match had run a cartoon recently depicting Fache as a police dog； trying to bite an American criminal； but unable to reach because it was chained to the U。S。 Embassy。
Not tonight； Fache told himself。 There is far too much at stake。
By the time Robert Langdon hung up the phone； he looked ill。
〃Is everything all right？〃 Fache asked。
Weakly； Langdon shook his head。
Bad news from home； Fache sensed； noticing Langdon was sweating slightly as Fache took back his cell phone。
〃An accident；〃 Langdon stammered； looking at Fache with a strange expression。 〃A friend。。。〃 He hesitated。 〃I'll need to fly home first thing in the morning。〃
Fache had no doubt the shock on Langdon's face was genuine； and yet he sensed another emotion there too； as if a distant fear were suddenly simmering in the American's eyes。 〃I'm sorry to hear that；〃 Fache said； watching Langdon closely。 〃Would you like to sit down？〃 He motioned toward one of the viewing benches in the gallery。
Langdon nodded absently and took a few steps toward the bench。 He paused； looking more confused with every moment。 〃Actually； I think I'd like to use the rest room。〃
Fache frowned inwardly at the delay。 〃The rest room。 Of course。 Let's take a break for a few minutes。〃 He motioned back down the long hallway in the direction they had e from。 〃The rest rooms are back toward the curator's office。〃
Langdon hesitated； pointing in the other direction toward the far end of the Grand Gallery corridor。 〃I believe there's a much closer rest room at the end。〃
Fache realized Langdon was right。 They were two thirds of the way down； and the Grand Gallery dead…ended at a pair of rest rooms。 〃Shall I acpany you？〃
Langdon shook his head； already moving deeper into the gallery。 〃Not necessary。 I think I'd like a few minutes alone。〃
Fache was not wild about the idea of Langdon wandering alone down the remaining length of corridor； but he took fort in knowing the Grand Gallery was a dead end whose only exit was at the other end—the gate under which they had entered。 Although French fire regulations required several emergency stairwells for a space this large； those stairwells had been sealed automatically when Saunière tripped the security system。 Granted； that system had now been reset； unlocking the stairwells； but it didn't matter—the external doors； if opened； would set off fire alarms and were guarded outside by DCPJ agents。 Langdon could not possibly leave without Fache knowing about it。
〃I need to return to Mr。 Saunière's office for a moment；〃 Fache said。 〃Please e find me directly； Mr。 Langdon。 There is more we need to discuss。〃
Langdon gave a quiet wave as he disappeared into the darkness。
Turning； Fache marched angrily in the opposite direction。 Arriving at the gate； he slid under； exited the Grand Gallery； marched down the hall； and stormed into the mand center at Saunière's office。
〃Who gave the approval to let Sophie Neveu into this building！〃 Fache bellowed。
Collet was the first to answer。 〃She told the guards outside she'd broken the code。〃
Fache looked around。 〃Is she gone？〃
〃She's not with you？〃
〃She left。〃 Fache glanced out at the darkened hallway。 Apparently Sophie had been in no mood to stop by and chat with the other officers on her way out。
For a moment； Fache considered radioing the guards in the entresol and telling them to stop Sophie and drag her back up here before she could leave the premises。 He thought better of it。 That was only his pride talking。。。 wanting the last word。 He'd had enough distractions tonight。
Deal with Agent Neveu later； he told himself； already looking forward to firing her。
Pushing Sophie from his mind； Fache stared for a moment at the miniature knight standing on Saunière's desk。 Then he turned back to Collet。 〃Do you have him？〃
Collet gave a curt nod and spun the laptop toward Fache。 The red dot was clearly visible on the floor plan overlay； blinking methodically in a room marked TOILETTES PUBLIQUES。
〃Good；〃 Fache said； lighting a cigarette and stalking into the hall。 I've got a phone call to make。 Be damned sure the rest room is the only place Langdon goes。〃
CHAPTER 12
Robert Langdon felt light…headed as he trudged toward the end of the Grand Gallery。 Sophie's phone message played over and over in his mind。 At the end of the corridor； illuminated signs bearing the international stick…figure symbols for rest rooms guided him through a maze…like series of dividers displaying Italian drawings and hiding the rest rooms from sight。
Finding the men's room door； Langdon entered and turned on the lights。
The room was empty。
Walking to the sink； he splashed cold water on his face and tried to wake up。 Harsh fluorescent lights glared off the stark tile； and the room smelled of ammonia。 As he toweled off； the rest room's door creaked open behind him。 He spun。
Sophie Neveu entered； her green eyes flashing fear。 〃Thank God you came。 We don't have much time。〃
Langdon stood beside the sinks； staring in bewilderment at DCPJ cryptographer Sophie Neveu。 Only minutes ago； Langdon had listened to her phone message； thinking the newly arrived cryptographer must be insane。 And yet； the more he listened； the more he sensed Sophie Neveu was speaking in earnest。 Do not react to this message。 Just listen calmly。 You are in danger right now。 Follow my directions very closely。 Filled with uncertainty； Langdon had decided to do exactly as Sophie advised。 He told Fache that the phone message was regarding an injured friend back home。 Then he had asked to use the rest room at the end of the Grand Gallery。
Sophie stood before him now； still catching her breath after doubling back to the rest room。 In the fluorescent lights； Langdon was surprised to see that her strong air actually radiated