Dead Letter Days (Rockton, #7.5)

Eric Dalton spent most of his life in Rockton, a hidden town in the Yukon for people who need to disappear. Now that sanctuary is gone, and he's holed up in a wilderness lodge with his girlfriend, Casey Duncan, and their friends, as they scout for a place to build their own Rockton. When Eric and Casey find a literal message-in-a-bottle, it leads them to the mystery of a woman who went missing decades ago, having never received that vital message. As they investigate that cold case, Dalton ...