Yup. "Fingerprints of the Gods" and "Holy Blood, Holy Grail" were my intro to so many rabbit holes over the years.
Oh, it was just an entry point to make me start looking around and seeing things differently. I'm way past believing most of what's in there.
But it doesn't hurt to consider some themes. There are bloodlines. The Templars and Bernard of Clairvaux and the Burgundians are important. But the hidden knowledge and the hidden bloodlines aren't about Jesus.