Ranger Archetype: Sleuth

Aided by their mental faculties and attunement to their surroundings, the Sleuth is perfectly equipped to uncover and subsequently arbitrate the consequences of other’s actions. Dispenser of justice, intelligence agent, or a private investigator; nothing slips past a Sleuth.

Detective's Intuition

When you take this archetype at 3rd level, you gain proficiency in the Investigation skill, or if you are already proficient in it your proficiency bonus is now doubled for Investigation skill checks.

Prime Suspect

Also at 3rd level, once per long rest you can conduct a ritual to turn a single creature on the same plane of existence into your Prime Suspect, granted you spend a short rest attuning to an object it has come into contact with in the past year. When targeted by this feature the creature must make a Wisdom saving throw against your ranger spell save DC. On a failed save the creature becomes your Prime Suspect, granting you the following benefits while on the same plane of existence as it: you sense the direction of your Prime Suspect when it is within 50 miles of you, have advantage on Insight checks against it, and it is held under the effects of a 1st level Hunter's Mark without requiring your concentration until dispelled. If the creature succeeds its saving throw it remains unaffected and immediately knows about the attempt to mark it. You can only keep one creature under this effect at any given time.

The attuned object's connection to your Prime Suspect can modify the Wisdom saveing throw's DC:

An object the creature has touched: +0

An object belonging to the creature: +2

A body part or shed piece of the creature: +5

Relentless Pursuit

At 7th level, when a creature you can see voluntarily takes cover, leaves your line of sight, turns invisible, or hides you may make one weapon attack against that creature and move up to half of your full movement speed as a reaction.

Primeval Awakening

Beginning at 11th level, when your use your Primeval Awareness class feature you can enter a deeper state of hyperawareness. On top of the normal benefits you get from Primeval Awareness you can now determine the exact number, type of creatures, and their exact distance away from you using this feature. Additionally, you can add your Intelligence modifier to your Initiative, Perception, and Passive Perception; you cannot be surprised for the duration.

Hardboiled

At 15th level, at this point in your career you've seen everything. Once per long rest, when you fail a saving throw you can instead choose to succeed it.