A series of mysterious incidents, including the disappearance of scientists and strange murders committed with the help of an antipsychotic drug, forces Ari McKenzie, at her own peril and risk, to resume the investigation, which was prematurely closed by order from above. This time he is on the trail of the mysterious Weldon, a mystic and occultist. In his lair in the house of the famous medieval alchemist Nicolas Flamel, Ari meets the young actress Marie Lynch, the daughter of the missing geologist Charles Lynch...