Relentless Tiger by Kit Tunstall

When tiger-shifter Devon Manchester went looking for his missing teammate, he found Tianna Barrett instead. A citizen journalist, she’s been quietly digging into the secrets of Project: Shift and helps Devon find his next lead. Now that the black ops knows about her existence, she has to come along with him as they pursue clues about a missing teammate’s whereabouts into the Canadian wilderness. Having her along is certainly no hardship, since he’s soon convinced Tianna is meant to be his mate. He’s determined to claim her—if they live long enough…