Trailing a Killer/Under Surveillance

Trailing A Killer by Carol J. Post
A killer with an explosive agenda...and a K-9 and determined detective on the case.
In a hurricane's aftermath, Detective Erin Jeffries is stunned when she and her search-and-rescue K-9, Alcee, uncover a collapsed building's only survivor, her long-ago ex, Cody Elbourne. And, it's quickly clear that the disaster was no accident. Now only Cody can identify the man who set the explosives that killed his grandfather...and Erin must stop the killer dead set on silencing him.
Under Surveillance by Jodie Bailey
She might not be the criminal he thinks she is...
When his neighbor, and suspect, Macey Price is attacked and nearly kidnapped, army operative Trey Blackburn comes to her rescue. But, this new development throws a wrench in his undercover assignment to surveil and befriend Macey. Is she a traitor selling government secrets...or is she being framed? The rules no longer apply, because in one night his mission changes, from proving her guilt to saving her life.