Status Updates From Storm Warning (The 39 Clues...

Lore drop: Gideon and Olivia Cahill had four children. Gideon created a cure for the plague, but became a serum that altered all the DNA of those who took it. He gave a part of the serum to each child. He then dies in a fire and each child thinks it was the other. For centuries, the branches have been trying to find the clues, and every time they’re close the Madrigal‘s stop them.