
During the investigation of a murder in a masked ball at the mansion of a prominent member of the island community, Holmes encounters an elderly police officer, who provides Sherlock with the missing information to conclude his quest. Further revelations cause adverse effects on Jon, who pleads Sherlock not to pursue his mission any longer and move on. As Holmes progressively regains his suppressed memories, his companion Jon is revealed to be an imaginary friend known only to Holmes brothers and communicable only to the younger Sherlock. Mycroft, using his contacts and influence, conducts a background check on the doctor but the search reveals little of use other than academic credentials and an estranged brother named Klaus.Īfter Sherlock unlocks his mother's private museum of debunked, bizarre artefacts, he recalls an incident whereby Otto Richter is harshly berated by Mycroft, who later appears to have testified against the doctor on grounds of the latter's medical malpractice. A resident physician, a Swiss doctor named Otto Richter oversees Violet's therapy and employs a controversial and experimental approach by immersing Violet in the original conditions that led to her breakdown. Tracing a former family friend, who is recently murdered, Holmes begins to piece together events through his patchy childhood memories and figures out that Violet was not, contrary to his brother Mycroft's assertion, suffering from tuberculosis but was in fact stricken with severe mental distress following the death of her husband Siger. Previously assuming the cause of death to be tuberculosis, Holmes begins to investigate loose ends regarding the case. Settling in his family's former residence, the dilapidated Stonewood Manor, Holmes encounters the eccentric gallerist Verner Vogel, who insinuates that Violet Holmes' demise may have undisclosed details. In 1875, ten years after the passing of his mother, Violet Holmes, 21-year-old Sherlock Holmes returns to the island of Cordona alongside his companion Jon. While investigating, Holmes must also reacquaint himself with his old friend, the enigmatic Jonathan (called "Jon"), who is described as "definitely not Watson".

There, Holmes uncovers a sinister conspiracy lurking beneath the surface of a seemingly idyllic town where corruption and crime are rampant, and the locals shun outsiders. Following the death of his mother, Violet, the young detective returns to his childhood home on the Mediterranean island of Cordona.

The plot follows a 21-year-old Sherlock Holmes at the beginning of his career as a "consulting detective".
