Watch Series The Rookie Season 4 Episode 21 online on Couchtuner streaming free.
Description for Watch TV Series The Rookie S4E21:
The Rookie Season 4 Episode 21: Mother's Day
Sergeant Grey supports Officer Nolan's desire to become a training officer and offers to ride with him for the day to get him ready. Meanwhile, Tim and Lucy must manage expectations in their respective relationships as they decide on their plans for Mother's Day and a romantic vacation.