For several days, Havelock focused his attention on finding new clues and evidence that could shed light on the mystery of Lord Livingston's murder. He spent many hours in the mansion's archive, where ancient letters, records and personal documents of the family were kept.

During another examination, Havelock came across an old, dusty drawer in one of the libraries, where there were letters sealed in dumb envelopes. After carefully examining the contents, the detective found a number of letters written by Lord Livingston to different recipients. These letters were addressed to unknown people and contained many references to financial difficulties, personal crises, and even hints of blackmail. Some of them were written in an aggressive tone and expressed obvious dissatisfaction and despair.

The letters also contained notes about the lord's alleged plans, which could not be carried out. One of these plans was related to the intention to sell part of the family property, which could greatly affect the financial condition of family members. Havelock suggested that these letters may contain key evidence showing Lord's motives and intentions.

After discovering the letters, Havelock began analyzing them and comparing them with other evidence. He decided to check each letter to determine how much they could confirm or refute the existing suspicions.

The first step was to determine who the letters were addressed to and what possible motive the recipients might have. Havelock found that one of the letters was sent to a private creditor with whom Lord Livingston had financial obligations. This letter contained threats and hints of possible actions if the creditor did not make concessions. The detective decided to find out who this creditor was and what his reaction to the threats was.

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Other letters were addressed to local officials and businessmen with whom the lord negotiated the sale of the property. Some of these emails contained information about plans that were thwarted at the last moment. Havelock contacted these businessmen and officials to find out if they had any conflicts with Lord and if they had any additional information that could shed light on his murder.

One of the letters was addressed to an unknown person who signed himself as "A. G.". Havelock began to search for information about the identity of this person. The investigation revealed that "A.G." was a well-known private detective who was in conflict with Lord Livingston over fraud and blackmail.

Havelock also checked the connection between the letters and previous finds, such as the lord's diary and the found ring. Some of the references in the letters coincided with the entries in the diary, which indicated that there were links between the personal conflicts of the lord and his death.

After Havelock collected and verified the evidence, he began to form a new version of events. He compared the letters with the testimony of family members and found that many of them were mentioned in the letters as potential participants in conflicts with the lord.

The documents showed that the financial pressure was significant and could become a source of conflict. This supported the theory that the motivation for the murder could be related to an attempt to hide financial crimes or personal grievances.

Havelock also noted that the blackmail and threats mentioned in the letters could have been part of a more complex plan aimed at manipulating others. The letters contained a lot of personal and compromising information that could be used for blackmail.

As a result, Havelock concluded that the investigation was reaching a new level. The letters and evidence provided a clear picture of how internal conflicts and financial problems could be linked to the murder of Lord Livingston.

Now the detective had only to determine how this evidence connected with the main suspects and what new steps needed to be taken to solve the crime. The new evidence opened up new perspectives, but also added complexity to an already tangled web of relationships and motives.