Steam rose from Audrey’s 1950s “First Lady Pink” bathtub as she shut the door and locked out her hectic 21st Century life. Past midnight, she was long overdue to relax, unwind and unplug. She twisted the knobs, stopping the flow of water from the faucet and tested the temperature with her toe. Just right.

She sank into the tub and sensed stress leaching from her tense muscles. The second she closed her eyes, she heard a soft tapping. Wide-eyed, her body stiffened.

“Mom...