Jack And Anna - The Price of Fear by R.S. Penney

Settling back into life on Earth isn’t easy for newly-weds Anna Lenai and Jack Hunter. Shapeshifting alien monsters? No problem! But have you tried to find a job in this economy?

Posing as ordinary citizens isn't easy. Especially for Jack, who was never very comfortable being ordinary. Anna, however, is eager for a little taste of normalcy, and she finds it with some new friends. But things get dicey when a wormhole in St. Louis brings a new visitor to our world. A terrifying creature is prowling through the city, and people are afraid to go out at night.

Anna and Jack must navigate a complex web of shifting alliances between various intelligence agencies. Complicating matters are the enigmatic Administrators: unnatural beings who pose as government agents, but who secretly possess a wide array of strange powers. And one of them has decided that Anna knows too much. She soon discovers that the real danger may not be the alien, but the CIA team that is trying to capture it.