When a toddler is found at the scene of a crime, John and Bailey must decide whether to let the child go to a shelter for the night or care for her themselves. Meanwhile, when someone from his past returns, Tim disappears and leaves Lucy in the dark.

When two teenagers go missing, it is up to the entire team to find the girls and uncover the truth about their disappearance. Meanwhile, Lopez and Harper are on a different kind of investigation – the search for the perfect nanny.