Fighting for love and family. Patrick O'Reilly left behind his medical practice when he and his siblings were forced into hiding. Determined to live through the war against their species, they vow to serve their kind. Patrick will risk it all to ensure none of them end up as experiments in a government lab. Clarissa Greenwood worked all her life to become a scientist and to get the position at Hathaway Medical where she thought she would be able to find cures for diseases. Instead, she is witness to experiments on shifters. Disgusted by the truth, she gathers as much information as she can, and flees. She wants no part of the experiments-even if the cost is her life. Shifters Underground was created to serve their species, not to help a human who had worked for one of the organizations that was hunting them. A message from a trusted shifter leaves them with no other option but to search for a woman who might be able to help them. A treacherous journey brings two destined mates together. Now Patrick and Clarissa must work together to protect not only each other, but all the shifters who fight for their lives, for love, and for family.