Ellie has never liked change. She misses fifth grade. She misses her old best friend. She even misses dearly departed goldfish. Then one day a strange boy shows up. He's bossy. He's cranky. And weirdly enough ... he looks a lot like Ellie's grandfather, a scientist who's always been slightly obsessed with immortality. Could this gawky teenager really be Grandpa Melvin? Has he finally found the …