Shifting Circle Series by Sharon Shinn

For fifteen years Maria Devane has been desperately, passionately in love with Dante Romano. But despite loving him with all of her heart and soul, Maria knows that Dante can never give all of himself back-at least not all the time. Every month, Dante shifts shape, becoming a wild animal. During those times, he wanders far and wide, leaving Maria alone. He can't choose when he shifts, the transition is often abrupt and, as he gets older, the time he spends in human form is gradually decreasing... moreFor fifteen years Maria Devane has been desperately, passionately in love with Dante Romano. But despite loving him with all of her heart and soul, Maria knows that Dante can never give all of himself back-at least not all the time. Every month, Dante shifts shape, becoming a wild animal. During those times, he wanders far and wide, leaving Maria alone. He can't choose when he shifts, the transition is often abrupt and, as he gets older, the time he spends in human form is gradually decreasing. But Maria, who loves him without hesitation, wouldn't trade their unusual relationship for anything. Since the beginning, she has kept his secret, knowing that their love is worth the danger. But when a string of brutal attacks occur in local parks during the times when Dante is in animal form, Maria is forced to consider whether the lies she's been telling about her life have turned into lies she's telling herself. .. less

Melanie Landon and her half-sister share a unique bond. For her entire life, Melanie has hidden the fact that Ann is a shape-shifter. The never-ending deception is a heavy weight to bear, but Melanie is determined to keep Ann’s secret and protect her from a world that simply wouldn’t understand. For months, Melanie hasn’t seen or heard from Ann, in either of her forms. When a man shows up saying he’s there about her sister, Melanie fears the worst... moreMelanie Landon and her half-sister share a unique bond. For her entire life, Melanie has hidden the fact that Ann is a shape-shifter. The never-ending deception is a heavy weight to bear, but Melanie is determined to keep Ann’s secret and protect her from a world that simply wouldn’t understand. For months, Melanie hasn’t seen or heard from Ann, in either of her forms. When a man shows up saying he’s there about her sister, Melanie fears the worst. But Brody Westerbrook doesn’t have information about Ann—he’s in search of it. A freelance writer, Brody intends to include Ann in a book he’s writing about the existence of shape-shifters. While Melanie is immediately drawn to the stranger on her doorstep, she denies his claims, knowing that trusting him isn’t an option. But when Ann finally appears looking thin and sick, Melanie realizes exposure is the least of their worries. Protecting her sister has always been such an enormous part of Melanie’s life, but as Ann’s health rapidly deteriorates, Melanie must come to grips with the fact that saving her may mean letting go…. less

Trust her old friends or her new love? Karadel could never escape being a shapeshifter. Despite her safe comfortable life as a rural vet with close shifter and human friends, she wants to be normal, working on a drug for shifters to be human. Then she meets a man who touches her heart, and her best friend is forced to shift publicly with deadly consequences.