Lucifer is a good choice for confident learners looking for more realistic and demanding listening practice. Some conversations move quickly, so learners may need to listen to certain parts more than once at first. Learners will hear plenty of useful natural English, but some lines may still require a second listen. Also, crime scenes may bring in words related to investigations, police or legal vocabulary. Some parts may require more focus, but the main story remains easy to follow. For learners around B1/B2, this can be a practical choice for getting used to faster spoken English.