221B BAKER STREET

After an agonisingly uncomfortable silence, John felt compelled to break it. Looking at his wife as he indicated the notebook that was still in Sherlock's hands. "If that belongs to you, who has had possession of it, and why?"

"Remember the wedding telegram?" Mary responded. "From Cam," she clarified when she received only blank looks

Sherlock's eyes immediately lit up in realisation. "Magnussen," he murmured.

Mary nodded. "The very same. Somehow he acquired it, and has clearly passed it on to other interested parties."

"Oodles of love and heaps of good wishes from CAM. Wish your family could have seen this." Sherlock quoted.

The reference to 'family' now held a far more ominous, and sinister meaning.

"Do you think they found what they were looking for?" John queried.

"Possibly."

"So why send it to Sherlock?"

"Why indeed," the detective responded. He flicked through the pages looking for any possible clues. "The real question that needs answering right now is, was this sent as a warning or a threat?"

"That would depend on who sent it," Mary replied.

Sherlock leant down and sniffed the notebook as he flicked through the pages for a second time. Whatever he smelt had him reaching for his scarf and belstaff. "We need to go to Bart's," he explained as he rushed out the door.

BART'S PATHOLOGY LAB

In the darkened lab Sherlock used ultraviolet lights to read the secret message in the notebook.

"You got that because of its scent," John concluded.

"Yes," the detective replied absent-mindedly, his brow furrowed as he read what had been revealed.

61 :+? '50?8 48( 0618 )48(0+-=

28 .(8.5(8!

;48: 5(8 -+96*3

"Well, it's a code obviously," he eventually noted. "Have you ever seen it before?' his question directed to the former assassin.

Mary looked at it for several minutes, eventually shaking her head.

"No matter," Sherlock responded confidently. "What can be encrypted can be decoded."

Mary nodded, but it was clear she had conflicting feelings about what was about to play out.

Her past it would seem was determined to catch up with her.