Marlo, a mother of three, including a newborn, is gifted a night nanny by her brother. Hesitant at first, she quickly forms a bond with the thoughtful, surprising, and sometimes challenging nanny named Tully.
Bored and unhappy as the Lord of Hell, Lucifer Morningstar abandoned his throne and retired to Los Angeles, where he has teamed up with LAPD detective Chloe Decker to take down criminals. But the longer he's away from the underworld, the greater the threat that the worst of humanity could escape.
When an overworked mother and her teenage daughter magically swap bodies, they have just one day to put things right again before mom’s big wedding.