Twelve-year-old Tommy is a quick-witted, street-smart foster kid whose knack for getting under adults' skin is nearly unparalleled. But life takes a twist when he's placed with his newest foster parent, a delightfully eccentric man who Tommy insists on calling “Grandpa.” From the moment Tommy steps through the door, its clear Grandpa’s home isn’t like any a life-sized dinosaur guards the lawn, dinners are served as “mud pies,” and each day brims with mystery and invention. Alongside a fellow foster child with an aristocratic name—and the attitude to match—Tommy (dubbed “Tomkins” by Grandpa) finds himself swept into a whirlwind of training regimens, enigmatic projects, and jaw-dropping adventures. As the trio bonds, Tommy discovers that beneath Grandpa’s charm lies a tangle of secrets—secrets that could alter everything he believes about trust, belonging, and family.