Possible Clues:

• British detective played by Michael Kitchen
• 'Kitty ___' (Ginger Rogers movie)
• Kitty, played by Ginger
• Derry's river
• 'Kitty ___' (1940 movie romance)
• Londonderry's river
• Christopher Morley novel 'Kitty ___'
• Ginger Rogers' Oscar role Kitty ---