"When a key witness goes missing, Quinn & Costa must find her before a killer silences her for good... Detective Kara Quinn is back in Los Angeles to testify against a notorious human trafficker, finally moving past the case that upended her life. But when the accused is shot in broad daylight, the chaotic scene of the crime turns up few reliable bystanders. And one witness--a whistleblower who might be the key to everything--has disappeared. After...