Rescue Operation (Military K-9 Unit, 5) by Lenora Worth

Racing to rescue a child Danger heats up in the Military K-9 Unit series A little boy is missing, and it's up to search-and-rescue K-9 handler Ava Esposito and her dog to find him...before the Red Rose Killer does. FBI special agent Oliver Davison is hot on the trail of the escaped convict and joins forces with Ava. But when the killer turns his crosshairs on them, Oliver must protect them all before time runs out.