"The Darkest Night" is the first Kaycee Miller suspense novel by Jodie Larsen. People are vanishing from America's national parks, and as the numbers climb, investigators race to find a thread connecting the missing. Kaycee Miller and Max Masterson — handlers in a certified Search and Rescue K-9 team — push into backcountry that has already swallowed others, and into a case that goes deeper than a string of bad-luck disappearances. Larsen leans on the procedural fundamentals: an SAR team that a...