Plot Summary

Death doesn’t frighten him… but the thought of losing her does.

Former navy SEAL Alan Burke is on the trail of a serial killer – and determined to protect Jo Summerlin.

As stubborn as she is beautiful, she insists on following a hunch into the limestone caverns snaking beneath Missouri.

They both know that they may be descending into a monster’s lair.

To get Jo out alive, will Alan have to make the ultimate sacrifice?