Examine the Colonial Collection | The Kew Gardens Drama SH: Crimes and Punishments Guide

Go to the room with low ceiling, behind the damaged door. Examine the Plants on the right and head to the empty part of the room. Activate Holmes's talent.

The Detergent and the Stone chip.

Examine the Detergent on the floor and the Stone chip a bit to the right. In the close-up mode, take a look at it (from both sides). Holmes will notice that it is a Fragment from a statue. Activate his talent once again and examine the Window panes.

Deduction

Connect "Emptied Colonial Collection" with "Dunne was trapped". You will obtain a task: "Perform autopsy".

Using the Map, head to Scotland Yard.