A local scientist misses his son's birthday party and turns up dead in Lake Superior. A radical environmental group blames a mysterious lab for dead fish found in a remote stream. Then an Alzheimer's patient goes missing and his home is ransacked.

Bree Nicholls and her beloved search-and-rescue dog, Samson, eagerly pitch in to help investigate the events disrupting their small community. But new discoveries soon throw her shaky love life into tilt, dredge up her painful past, and threaten her family. Bree must dive deep for the faith to keep going, the strength to defend those she cares about, and the courage to keep her fearful heart open to love.

Into the Deep is third in the acclaimed mystery series from best-selling author Colleen Coble. Set in the untamed beauty of Michigan's Upper Peninsula, the Rock Harbor Series deftly weaves suspense and romance into the life and operation of a canine search-and-rescue team as it helps unravel the secrets of an enchanting wilderness.