The Mystery of the Druids is a single-player adventure video game developed by House of Tales Entertainment and published by cdv Software Entertainment. The game was released on November 8, 2001 for Microsoft Windows in North America.
The story takes place in Britain, where Detective Brent Halligan, an inspector at Scotland Yard, investigates a brutal series of murders committed in England. The investigation leads Detective Halligan into a mystery surrounding the demise of the British Order of Druids and eventually takes him on a trip through time itself.
A large portion of the game-play in The Mystery of the Druids consists of discovering clues and solving puzzles. Clues are mainly found by moving the computer mouse over various objects on the screen and clicking them to add them to the inventory or gain information about them. Puzzles are often solved by combining items, after which the player must figure out how the item is used. Many actions in the game require the completion of such puzzles, such as being able to use a telephone.
Interaction with non-player characters is accomplished through dialog trees, most of which is "entirely expository". These conversations with non-player characters are essential to playing the game, as many of the major plot points are revealed through conversation rather than through investigating the environment.