Examine the necklace (included in the evidence bag for Part 4) carefully. What other pieces of evidence can you connect it to?

The necklace can be connected to the Gordon's Trinkets receipt using one other piece of evidence.

Look at the Shadows Over Millfield review carefully.

There is an ad for Gordon's Trinkets in the Shadows Over Millfield review. The ad features a one-of-a-kind vintage "Heart Necklace" with a cat on it priced at $34.68. This necklace (from the ad) matches the necklace found at the crime scene (they look identical). This necklace (from the ad) also matches the necklace described in the Gordon's Trinkets receipt (same name, i.e. "Heart Necklace", and same price).

Since this is a one-of-a-kind necklace, we can conclude that the necklace listed on the Gordon's Trinkets receipt is the necklace that was left at the crime scene. We can assume Summer's killer purchased the necklace, and the Gordon's Trinkets receipt reflects that purchase.

When was the necklace bought? Do any remaining suspects have alibis for when the necklace was bought?

Read the Mercy Hospital Staff Schedule.

The Mercy Hospital Staff Schedule shows that Harrison was working when the necklace was bought. We can eliminate Harrison as a suspect.

The relevant pieces of evidence are:

• The necklace, the Shadows Over Millfield Review, and the Gordon's Trinkets receipt — shows that the necklace Summer's killer left at the crime scene is the necklace from the Gordon's Trinkets receipt.
• The Mercy Hospital Staff Schedule — shows that Harrison was working at the time the necklace was purchased (as per the Gordon's Trinkets receipt).