There are 2 books in the Leviticus series. The newest book is Under the Wall which came out in 2015.

1
Through the Woods

Book cover of Through the Woods
Ben, fresh out of college, is starting his first week of work at a top secret governmental agency deep in the protected woods in the north of the country. He can only pick up bits and pieces about the fantastical things that go on at 'the Agency,' but he quickly…
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2
Under the Wall

Book cover of Under the Wall
Where 'Through the Woods' ended, the real story begins... Out of an entire litter of dangerously telekinetic felines, two cats alone remain. Deinonychus, bent on domination, has been adopted by an apathetic mother and her overly-enthusiastic little girl. Without the live food or freedom to wield his power, he is…