The grim details of the newspaper article sent a shiver down Coby’s spine, reminding him of his purpose. With a heavy heart, he tossed the paper aside and trudged towards the ancient library. His shoulders slumped in sadness, matching the weight of his emotions. Shadowmere, the ominous black cat, stood by the entrance, its piercing amber eyes fixed on Coby. It let out a low, eerie meow as he walked in, and as he settled into a hard chair, the cat purred softly, its vibrations reverberating through the seat.
Coby retrieved Daisy’s weathered leather journal and Alistair Chancellor’s worn journal, placing them side by side on the table. His eyes strained as he tried to decipher the cryptic notes, the two-letter phrases blurring together on the pages. The words seemed to dance before his eyes, forming an indecipherable code.
However, amidst the chaotic jumble in Daisy’s journal, a pattern slowly emerged. A sequence of letter pairs kept appearing, repeating themselves like a hidden message. Excitement surged within him as he traced the pattern, a spark of recognition igniting in his mind. With a startled exclamation, Coby could almost feel Daisy’s ethereal presence, as if she was pulling him towards the next clue, even from beyond the grave.
Suddenly, Shadowmere hissed menacingly, baring its sharp teeth, startling Coby. He sprang up from his chair, hastily wiping the whiteboard clean. With frantic scribbles, Coby documented his findings, noting the similarities in the phrases. The vibrant pairs of letters sprawled across the whiteboard, forming a chaotic tapestry of clues. Stepping back, Coby examined the two-letter phrases, his mind racing. Yet, no words formed, leaving him perplexed. Frustration welled up inside him, but then a glimmer of recognition flickered in his eyes. He realised that the date entries were not encrypted, suggesting that this particular encryption method was meant for letters alone.
A surge of inspiration coursed through his veins as he made the connection. Shadowmere, sensing his excitement, meowed affectionately as Coby settled back into his chair before his laptop. Opening the FaceTime app, he dialled his friend, Logan Parry, a military historian. The call chimed endlessly, testing his patience. He gave up, feeling a wave of despondence crash over him as he ended the call.
However, his laptop suddenly chimed, and his face brightened with joy as Logan’s face appeared on the screen, illuminating the room with a warm glow.
“Professor Parry!” Coby exclaimed, a mischievous grin on his face, playfully using his friend’s title. The sound of Logan’s boisterous laughter reverberated through the small laptop speakers, filling the room with warmth and camaraderie.
“Coby, you always seem to refer to me as ‘professor’ when you have a favour to ask. How may I assist you this time?”
Coby picked up Daisy’s journal, its well-worn pages rustling softly in his hands, and held them before the camera. He anxiously bit his lip, a mix of anticipation and curiosity filling the air. “Could you please let me know what encryption method this is?” he asked, his voice tinged with a hint of excitement.
Logan, his intelligent hazel eyes sparkling behind his glasses, let out a thoughtful grunt. His greying fringe cast a shadow over his eyes, adding a touch of wisdom to his countenance. He calmly and composedly asked, “Could you show me again?”
Coby lifted his laptop and walked over to the whiteboard, the camera lens capturing the vibrant, intricate patterns of the encrypted letters. Just then, Gracie sauntered into the room carrying a tray adorned with the enticing aroma of freshly baked pastries and a steaming cup of tea. Her eyebrows arched in surprise as she paused, taking in Coby’s amusing antics, before gently setting the tray down on an ornate table.
“Hold on for a second,” Logan said, his voice steady and focused. Coby settled back into his chair, his gaze fixed on the crown of Logan’s head as he bent over, meticulously searching through the pages of a thick book. Shadowmere purred softly, its fur tickling against the back of the laptop screen as it sought warmth.
Finally, Logan cleared his throat, breaking the silence. “If I’m not mistaken,” he started, his words filling Coby’s veins with a surge of excitement, “that appears to be the Playfair Cipher, which was developed in the late nineteenth century.” He delved into a detailed explanation of its popularity and its use by British soldiers, his words resonating with historical significance.
Coby’s excitement grew too strong to contain. “Are you absolutely certain?” he interrupted eagerly. Intrigued by their discussion, Gracie stepped closer, her gaze fixated on the laptop screen, her curiosity palpable.
Logan adjusted his glasses, a slight gesture that spoke volumes of his expertise. “Yes,” he responded with confidence, “however, a keyword is required to decode it.” His words dampened Coby’s initial enthusiasm, leaving a sense of frustration lingering in the air.
“Which keyword are you referring to?” Coby snapped, his impatience seeping through his tone. Gracie instinctively placed a calming hand on his shoulder, a gentle reminder to remain composed.
“To decipher the cryptic messages,” Logan calmly explained, “the sender and receiver would have employed a common keyword.”
Coby tugged at his hair, the frustration bubbling up inside him. “Is it possible to find the keyword online?” he asked.
Logan nonchalantly shrugged, his voice brimming with useful suggestions. “Why not give it a shot?” he proposed. “Alternatively, you could seek assistance from a cryptanalyst.”
“Thank you, Logan,” Coby said, his voice filled with a touch of sadness as he hung up the phone.
Gracie’s delicate fingers glided over Coby’s tense neck muscles, releasing the knots that had formed. With a voice as gentle as a cool summer breeze, she asked, “How can I be of help?”
Coby slowly rotated his head, feeling the stiffness in his muscles give way with a gentle crackling sound. “I need the keyword,” he responded, his voice filled with both relief and determination. “It’s crucial for decrypting the secret messages exchanged between Daisy and Alistair.”
With a reassuring smile, Gracie poured a steaming cup of tea and arranged a plate of pastries. “If you explain it to me,” she said, her eyes filled with curiosity and sparkling, “I can help you decipher the messages.”
Coby embraced the opportunity and grabbed a pastry as he headed towards the whiteboard. He swiftly removed the colourful writing, unveiling a pristine surface. With meticulous precision, he effortlessly drew a clean 5x5 grid on the glossy whiteboard, smoothly guiding the marker across its sleek surface. Beside the grid, he wrote out the intriguing phrase ‘HK FN RQ EX.’
“Ready?” he asked, a warm smile forming on his face when he saw Gracie’s wide-eyed expression. Continuing with a gentle tap on the phrase, he added, “Let’s assume the keyword is ‘summer’.”