Early on in “Adulthood,” siblings Meg and Noah Robles suddenly — and unhappily — learn why they never got to have a dog growing up.

It’s not because their parents didn’t think they could handle the responsibility or because dogs can be messy. It’s because there was a body walled up in the basement.

“How could our parents act like nothing ever happened?” Noah Robles asks. “That’s worse than the killing. It’s not, but still. They called it the ‘playroom.’”

That 30-year-old corpse will soon unleash a suburban comedy of errors as the bungling brother and sister — raised on TV police procedurals — try to find a way out of this mess without losing their freedom or precarious lifestyles.

“I wrote for two seasons on ‘Blue Bloods.’ I know how cops think,” says Noah Robles, a wonderfully childli

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