22 Seconds (Women's Murder Club Series, Book 22) by James Patterson & Maxine Paetro
 
22 seconds... until Lindsay Boxer loses her badge—or her life.

SFPD Sergeant Lindsay Boxer has guns on her mind.
 
There’s buzz of a last-ditch shipment of drugs and weapons crossing the Mexican border ahead of new restrictive gun laws. Before Lindsay can act, her top informant tips her to a case that hits disturbingly close to home.
 
Former cops. Professional hits. All with the same warning scrawled on their bodies:
 
You talk, you die.
 
Now it’s Lindsay’s turn to choose.