Martin looked over her shoulder. She had attempted all ten sentences, but three were wrong. Instead of giving up, she had penciled tiny question marks in the margins.

Once upon a time in the sleepy town of Grammar Green, there stood a dusty, venerable old bookshop. Its shelves were crowded with dictionaries, thesauruses, and—most famously—a towering stack of copies of Wren & Martin’s High School English Grammar and Composition .

Martin smiled and added a final line beneath her handwriting: “Grammar is not a cage. It’s the trellis that lets your thoughts grow straight and strong.”

Their job was simple: each night, when the bookshop closed, they would climb into the latest copy of Wren & Martin sold that day. They would check every exercise, every tricky transformation of sentences, every voice change from active to passive. And they would leave behind invisible solutions—hints, clarifications, and corrections—for any student who truly tried.

One night, Wren and Martin visited that same copy again and found Riya’s notes. Wren grinned. “She’s become a guardian, too.”

Wren was the problem-spotter. He darted between sentences, finding every misplaced comma, every dangling modifier, every rebellious verb that refused to agree with its subject. “Look here, Martin!” he’d chirp, pointing at a sentence in Exercise 42. “The flock of sheep were running.” “Singular collective noun! ‘Was,’ not ‘were’! Chaos!”