A serial killer starts killing again coinciding his kills with the blue moon providing Woody (Jerry O'Connell) with a partner (Camille Guaty). The prime suspect (Reed Diamond) escapes before they can gather enough evidence to prove he is Leviathan. Nigel (Steve Valentine) and Jordan (Jill Hennessy) figure out how Leviathan plans his kills while Garrett (Miguel Ferrer) and Bug (Ravi Kapoor) autopsy his most recent victim.
A cat eats a missing bullet, one Seely (David Monahan) desperately needs to get out of trouble with his boss. Lilly (Kathryn Hahn) refuses to let the bullet be surgically removed. A "mystery man" is in the morgue, which has no heat.