Millionaire Mason Murphy renovates the haunted Mayhew mansion. He plans a tremendous lunar eclipse viewing party to celebrate his return to his hometown of River Ridge Iowa. At the party, magic runs out of control and the party guests are murdered one by one.

When three friends finally come to after a raucous night of bachelor-party revelry, they find a baby in the closet and a tiger in the bathroom. But they can't seem to locate their best friend, Doug – who's supposed to be tying the knot. Launching a frantic search for Doug, the trio perseveres through a nasty hangover to try to make it to the church on time.