Timeline of Events

[Dr. Bloodworth]

ca. June 4. Maud Marrick meets a rather dishevelled and haggard Arthur, who mentions that he had met a girl he was going to marry.

June 10. Police are called to Arthur's Islington flat to break up a fight between himself and Peter Blaylock.

June 11. The police are called to the Islington townhouse a second time, according to the landlord Mr. Giles.

June 14. Lord Godfrey Sommers receives a ransom note asking to meet in Wellclose Square, but the ransomer never shows up.

June 18. Beginning of the investigation.

Let me know if there's any more events to add. I think this is all you have specific dates on.