A young mother and her infant child are ruthlessly gunned down while returning to their car in the garage of a shopping mall. There are no witnesses, and Detective Lindsay Boxer is left with only one shred of evidence — a cryptic message scrawled across the windshield in bloodred lipstick. The same night, the wife of A-list actor Marcus Dowling is woken by a cat burglar who is about to steal millions of dollars' worth of precious jewels. In just seconds there is a nearly empty safe, a lifeless body, and another mystery that throws San Francisco into hysteria. Lindsay spends every waking hour working with her partner, Rich — and her desire for him threatens to tear apart both her engagement and the Women's Murder Club.