Set in the same world as her "Mercy Thompson" books, this set features Anna Latham (a rare "Omega" werewolf) in adventures with the Marrok's younger son - Charles Cornick. Omnibus of novelet "Alpha & Omega" (2007), plus novels Cry Wolf (2008) + Hunting Ground (2009) + Fair Game (2012.) Title appears as "Alpha & Omega / Call of the Hunt" on cover & spine of dustjacket, but only as "Alpha & Omega" on pre-title page; title pages have "Alpha & Omega" with the contents listed below. The first 2 novels were paperback originals - this omnibus is their first hardcover appearance. (They had single hardcover reprints a couple years later - those are rather hard to find.) Early paperbacks of Cry Wolf did not include the novelet where Anna met Charles - making for a confusing read as the novel follows directly from the end of "Alpha & Omega."

Cry Wolf (paperback original in 2008, hardcover omnibus in 2012, single-hardcover reprint in 2013.)
[Here's the flap-copy of the hardcover-reprint (which included "Alpha & Omega" - so the summary mainly describes the initial novelet)]:
Anna never knew werewolves existed, until the night she survived a violent attack... and became one herself. After three years at the bottom of the pack, she's learned to keep her head down and never, ever trust dominant males. Then Charles Cornick, the enforcer - and son - of the leader of the North American werewolves, came into her life.

Charles insists that not only is Anna his mate but she is also a rare and valued Omega wolf. And it is Anna's inner strength and calming presence that will prove invaluable as she and Charles go on the hunt in search of a roque werewolf - a creature bound in magic so dark that it could threaten all the pack...

Anna and Charles have just been enlisted to attend a summit to present Bran's contoversial proposition: that the wolves should finally reveal themselves to humans. But the most feared Alpha in Europe is dead set against the plan - and it seems like someone else might be too. When Anna is attacked by vampires using pack magic, the kind of power only werewolves should be able to draw on, Charles and Anna must combine their talents to hunt down whoever is behind it all - or risk losing everything...

Fair Game (British hardcover original in 2012, hardcover omnibus in 2012, American hardcover reprint in 2012.)
[From the flap-copy of the hardcover-reprint]:
It is said that opposites attract. And in the case of werewolves Anna Latham and Charles Cornick, they mate. The son - and enforcer - of the leader of the North American werewolves, Charles is a dominant Alpha. While Anna, as Omega, has the rare ability to calm others of her kind.

Now that the werewolves have revealed themselve to humans, they can't afford any bad publicity. Infractions that could have been overlooked in the past must now be punished, and the strain of doing his father's dirty work is taking a toll on Charles.

Nevertheless, Charles and Anna are sent to Boston when the FBI requests the pack's help on a local serial-killer case. They quickly realize that the last two [3] victims were werewolves, and identify others originally thought to be human as fae. Someone is targeting the preternatural. And now Anna and Charles have put themselves right in the killer's sights...