The White Widow’s Revenge. Jacob Grey

metal-cutting equipment. And Lydia was right about the chimneys – they were too small.

      Too small for a human anyway …

      Caw scrambled to his feet. He edged back to the vents beside the hatch. They were about a foot across.

      “A crow could fit down there,” he said.

      “Good thinking!” said Lydia.

      Caw turned to Screech, who looked away as if he was suddenly very interested in something in the distance.

      “Screech,” Caw said, “can I borrow you for a moment?”

      The crow plodded over. Why me?

      “You’re the smallest,” said Caw. “Glum wouldn’t fit.”

      Yes, I would! said the old crow indignantly.

      Shimmer sniggered. Too many French fries. Hey – I’ll do it! She hopped excitedly from side to side.

      But Screech shook his wings. Go on then. Bring me back in one piece, OK?

      “Of course,” said Caw. He closed his eyes, and concentrated on his mental image of Screech. He felt his spirit detach from his body as it searched for the young crow. For a moment he floated on nothingness, then the crow body drew him in with a sort of feral gravity.

      As Caw felt his talons touch the ground, he opened his eyes and found himself perched among the other crows. Several regarded him with curiosity, as if they sensed a different aura about him. He saw his human body lying motionless beside Lydia, eyes rolled back in his head. He took a few steps, getting used to the new configuration of limbs. He opened his beak – Screech’s beak – and squawked.

      In truth, he’d chosen Screech because he was the easiest crow to control. Caw wasn’t sure why – perhaps because he was the youngest, or perhaps it was just because their connection was stronger – but Shimmer was definitely harder, and Glum almost impossible.

      “Are you in there?” said Lydia, crouching to look into his eyes.

      Caw bobbed his head up and down in answer.

      “That’s so cool,” said Lydia.

      Caw flexed his wings and hopped up to peer over the edge of the vent. Below lay a black abyss – even with his enhanced crow vision – curving downwards.

      Good luck, said Glum.

      I’m coming with you, said Shimmer. Her talons rattled on the steel alongside him.

      Caw stepped forwards and felt his claws skid for purchase. He tumbled into darkness.

      He flapped his wings in panic, but there wasn’t any room to extend them as he fell. He heard Shimmer cry out and felt her body buffeting against his. They crashed down on to more metal. Shimmer landed beside him in a tangle as dust filled his beak.

      You OK? Shimmer asked.

      I think so, replied Caw.

      He turned in the gloom, and saw a dim light to his left. He skittered down the shaft towards it. Three slats crossed the opening, but by flattening his wings he popped through to the other side. Caw was in a narrow stairwell with bare walls of patchy plaster. He guessed it was there to give access to the roof, for repairs. Shimmer flapped through too, scattering a loose feather. She was covered in dust and cobwebs.

      Up there, said Caw.

      At the top of the steps, a vertical ladder led to the underside of the metal hatch they’d seen on the rooftop. On this side, a simple rusty bolt was drawn across. He and Shimmer flew up. Caw twisted his head and took the bolt in his beak. He strained his neck and managed to shift it a fraction.

      Help out, will you? he said.

      Shimmer joined him, fastening her beak on the bolt as well. Together they succeeded in moving it across.

      Lydia, it’s open! Caw shouted, forgetting for a moment that he was talking in crow.

      But his friend must have heard the sound of the bolt shifting. The hatch swung open from above, and she grinned down. “Nice work, guys!”

      Caw flew out on to the roof, and landed next to his motionless human form. He concentrated hard on letting his aura split from Screech’s and wobbled slightly as he reassumed his normal body.

      Screech blinked then pecked him on the ear lightly. You got me all dirty.

      “Sorry,” said Caw. “And thank you.”

      Lydia started to climb down the ladder into the service stairwell. Caw followed her, instructing all the crows to stay on the roof apart from Glum, Screech and Shimmer.

      At the bottom they came to a plain metal door. Caw turned the handle slowly and opened it up a crack. The corridor on the other side took him by surprise.