Lucy Chen undone

Spin off linked to the Rookie.
Lucy loves her job as a police officer. She faces a challenging call and things go horribly wrong. She starts falling apart and finds comfort in an unlikely source. Something more sinister is at play when she notices a single man strolling up and down her street every morning and night. What does he want? Why does he just walk? Why is he interested in Lucy? Her life is about to get worse...