Win "Coal" Keegan has just landed in his latest foster home, with a big, noisy, slightly nosy family named the McKays. They seem eager to welcome Coal, but he's wary of trusting them. So, he doesn't tell them that he went for a walk with chalk in his pocket to cover a nearby street with his art. He doesn't tell them that a neighbor found Coal drawing, pulled a gun on him, and fired it. He doesn't tell them the police chased him. And he definitely doesn't tell them that when everything went down, Coal somehow turned invisible.

But he did.

Now he has to figure out how. Is he a superhero? Some kind of mutant? A science experiment? Is that why he has no family of his own? As Coal searches for answers and slowly learns to control his invisibility, he turns to the McKay kids and friends both new and old for help. But they soon discover they're not the only ones looking for a Black boy with superpowers, and the situation is far stranger—and more dangerous—than they ever could have expected.