Source: Unearthed Arcana 38 - Feats for Skills

You have an eye for detail and can pick out the smallest clues. You gain the following benefits:

• Increase your Intelligence score by 1, to a maximum of 20.

• You gain proficiency in the Investigation skill. If you are already proficient in the skill, you add double your proficiency bonus to checks you make with it.

• You can take the Search action as a bonus action.