Colby Law: Colby Law / At His Command (Colby, TX, Book 1) (Mills & Boon Intrigue)

Colby Law by Debra Webb
To solve the most heinous murder in Texas history, Colby investigator Lyle McCaleb has an unusual mission: find and protect the killer's long-lost daughter. The complication: she's tough, gorgeous rancher Sadie Gilmore - Lyle's first and only love. And now the mysterious past she barely remembers is threatening her very existence.
Lyle regrets leaving Sadie broken-hearted seven years ago. And as he investigates and gets deeper into danger, he finds it almost impossible to maintain his professionalism around her. But another dilemma threatens their newly rekindled relationship. Can Lyle regain Sadie's trust while concealing the secret that may devastate her?

At His Command by Karen Anders
Six years after her brother's death in an F-18 fighter jet crash, Lieutenant Ambrosia "Sia" Soto must investigate another pilot fatality aboard the U.S.S. James McCloud. A routine training mission claimed the life of a senator's son, and Sia must shelve her family demons to find answers. There's just one hitch. Leading her on the investigation is NCIS agent Chris Vargas: her former lover and the man she blames for her brother's death.
Can Sia bury old feelings for Vargas and overcome the past? And is there someone aboard the McCloud who knows more about these pilot "accidents" than they're letting on? Sia has more questions than answers, and what she uncovers will rewrite history as she once knew it.

Debra Webb has penned more than one hundred novels, including her internationally bestselling Colby Agency series and the romantic thriller series Faces of Evil, which propelled Debra to the top of the bestseller charts and garnered critical acclaim from reviewers and readers alike.