The Challenge

Summary

Blackmailed and sidelined from investigating, Sherlock Holmes finds hope when a young woman arrives on his doorstep, potentially holding the key to solving the kidnapping of an ambassador's daughter.

Guest stars

• Mary O'Driscoll as Mrs. Halligan
• Fiona Glascott as Lady Violet Somerset
• Aidan McArdle as Chief Inspector Whitlock
• Flynn Gray as Roberto Ricci
• Doireann May White as Martha Ricci
• Shane Lynch as Innkeeper
• Kasper Andreasen as Cooper
• Senan Jennings as Shrimpy
• Hyoie O'Grady as Charlie Holroyd
• Jamie Beamish as Constable Evans