How much havoc can a medieval mage wreak in 21st century San Francisco Bay Area?

Kay’s UC Berkeley life has utterly changed with the incursion of medieval meddling and middle-ages-want-to=be hackers!

Kay’s kids are finally back in Northern California. Does life go back to normal? Not when Galfride finds how much trouble he can make in online worlds. Add to that the gamers who’ve figured out the Halefin family has traveled back in time. A fourteenth century house appears in the Berkeley hills, apparently unoccupied. But is it? On top of that, UC Berkeley holds secrets that shouldn’t be uncovered.