Undercover Assignment (Rocky Mountain K-9 Unit Book 4) by Dana Mentink

From USA TODAY bestselling author Dana Mentink. This K-9 will stop at nothing to keep a child safe. When a little boy is threatened, Officer Daniella Vargas and K-9 partner, Zara, are assigned to pose as his nanny to uncover the culprit’s identity. Suspecting one of the guests in his inn, widower Sam Kavanaugh’s only option is to begrudgingly trust Daniella and Zara to help. But can they solve the case and its mysterious connection to Sam’s late wife before it’s too late?