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From Joe's writing

The “Twilight Zone Telephone,” as she’d taken to thinking of the device she’d found, had shut itself off sometime during the night. It began flashing a “low charge” message just after she’d run home, but she had no idea how to power the thing. Some superstitious part of her brain worried that the gadget’s demise was a sign that Henry would never regain consciousness, but she knew that was silly.

— Leap Year, chapter 4