Gabriel Knight 3: Blood of the Sacred, Blood of the Damned

"Four years after the events of the second game, Gabriel and Grace are asked by the exiled Prince of Albany to protect his newborn son from a centuries old family threat which appears to be a group of vampires. Shortly afterwards, the boy is kidnapped and Gabriel follows the kidnappers to the mysterious French village of Rennes-le-Château. Gabriel's arrival coincides with that of a tour group;