Shadow Memories — Nicholas Erik

Cassie Atwood and Kurt Desmond are small time private investigators, catching wayward husbands, stray dogs and other boring cases around the sleepy oceanside slum of Seaside Heights.

Until one day, a client comes in, offering them forty grand. All they've got to do is find a local cave, snap a few pictures of the ancient art on the wall. Easy.

But the pair soon find themselves embroiled in a 10,000 year old mystery. And they might just discover that we're not alone.