Related Clues:

• Code observed by whodunnit writer
• Code using dots and dashes
• Tapped-out code
• Inventor and artist
• Famous code developer
• TV Oxford cop
• Detective is brought in increasingly
• Code; TV detective
• A code
• Extra small to carry, it's useful for sending messages
• Dotty copper dashes away signalling in code
• Beginning to signal in additional code
• Some worried about the end of another walrus
• Inspector getting extra drop of Scotch in
• Inspector again arresting leader of sect