Find Detective Ryan's key:

Go near the Chief's office door and eavesdrop on the call. It seems that Detective Ryan lost the evidence locker key. He thinks he lost it at Pancake City.

Go back to your cell and use the phone. Call Ned or George to ask help finding the key. Transfer the case.

George or Ned:

Follow Detective Ryan's trail: Exit the area and be at map. Go to the places Detective Ryan visited.

Pancake City is below the Riverfront Park at bottom of the map. Mabel Rose's is close to top left of the map.

The Antiques Shop is at middle of the map above the river.

Antiques Shop: Go to the antiques shop.
Check the display on the table across from the New Arrivals shelf. Take the free glass vial.