Chasing the Alpha by Viola Rivard

Shifters of Nunavut continues…
After over a year of pursuit, Indigo has finally found the male whose scent calls to her on a primitive level. Strong, intelligent, and unbearably beautiful, she knows that Sten is destined to be her mate.

Brother and advisor to the most formidable alpha in the arctic, Sten is comfortable in his position as a beta male. He has no idea what to make of Indigo, a shifter female nearly half his age, who seems convinced that he’s to be her mate and the sire of her pups. But as chaos and upheaval ripple through the tundra, Sten finds himself with a powerful need to keep the eccentric female by his side, even if it means defying both of their brothers.