In 2000, at New Scotland Yard in London, Detective Brent Halligan has been assigned to investigate a series of brutal murders known as the "Skeleton Murders". Assisting him with his investigation is Dr. Melanie Turner, an anthropologist at the Oxford Anthropological Museum, who, along with historian Arthur Blake, discovers that the murders match the description of cannibalistic sacrificial rites performed by Britannic druids. It is later revealed that a demonic superior druid seized power over the druids in order to force mankind to submit to his rule by performing a "final ritual", which would transfer the knowledge and power of the druids to five infants known as the "Inheritors". The ritual was not entirely completed, but the Inheritors are strong and powerful enough to complete the ritual themselves.
While investigating a lead regarding a group of neo-Druids called "The Circle", Halligan is captured and held prisoner by their leader, Lord Sinclair. Halligan escapes, but discovers The Circle performing a human sacrifice and faints. Halligan awakens at dinner and, unbeknownst to him, is eating human flesh which grants strength and power, but also makes them susceptible to brainwashing.
Turner is led to Lord Sinclair's estate through information which Halligan had left at her museum, after which she is able to sneak in to the property. She finds an artifact, the Amulet of Transformation, which may be required to complete the Final Ritual. Halligan discovers her and a fight ensues before she is able to knock him unconscious. As he awakens, he discovers that he was brainwashed. He discerns Sinclair's plan, which is to put a curse on the world in order to enslave humanity.
If Turner is noticed while trying to rescue Halligan, Lord Sinclair's security will capture her. She is brought inside, where a brainwashed Halligan, who does not seem to recognize her, informs her that she will be the guest of honor for their dinner. A few days later, the skeleton of Turner is found in a forest near London. Halligan is listed as missing and last seen leaving his Scotland Yard department.
Blake is killed by Sinclair, but he points them in the direction of the Twelve Bridges ruins. Once there, Halligan and Turner are sent back in time. Halligan stumbles on the site of the ritual and attempts to disrupt it, but is interrupted by the demonic druid Serstan, who holds Turner hostage. A staff that Halligan had found is bartered for Turner's life and a promise, on his honor, not to harm Halligan or Turner. Serstan agrees and begins the ritual, whereupon Halligan and Turner are transported back to their own time.
Halligan and Turner rush to Stonehenge where The Circle is attempting to complete the final ritual. Halligan stabs Turner with scissors and informs Serstan that the vow has been broken, causing Serstan to intervene and cause the Circle to disappear and preventing the ritual from being completed. Turner is near death, but Halligan is able to save her using magical mistletoe, after which they share a kiss.
Reception
In the German market, The Mystery of the Druids debuted at #29 on Media Control's computer game sales chart for March 2001. Alex Watson of GameSpot UK wrote that the game had become a "big hit" in Germany by July. Golem.de similarly reported that the game was "quite successful".
The Mystery of the Druids received mostly negative reviews. Brett Todd of Computer Games Magazine proclaimed it "poorly designed, ugly, and rife with bugs." Computer and Video Games derided its "unimaginative settings and painful dialogue" as well as its inclusion of "some of the most ridiculously complex puzzle sequences to achieve even the simplest of tasks" before deciding that it has "very little appeal for anyone but the most patient and geeky PC-head." GameSpot described its characters as "rude", its puzzles and dialogue branches as "confusing", and the game overall as "surprisingly devoid of plot." GameSpy described it as being a game that might make customers "take matters into their own hands and put the adventure game genre out of its misery". IGN described its repetitive game-play as being "stretched out considerably (and not in a good Tantric kind of way, mind you)", stating "if you go back knowing what to do, you could beat the game in half a day."
In a positive review, PC Zone's Mark Hill wrote that the title's "closest gaming relatives are Broken Sword and the Blade Runner game, but Druids is far superior to both." He summarized it as "best serious adventure game in years".