The three-year-old daughter of Mark Mallen's old friend has been kidnapped. And when a child goes missing from San Francisco's notorious Tenderloin District, there's not much of a chance that she's going to be found. But that won't stop Mallen. When his first lead takes him to a murder scene with a stash of child porn, Mallen knows he's on the right track. Now the only people who can shake him off the trail are two SFPD detectives who seem to be more...