Absolute P.I.

It all started, one spring morning, with a complicated calculus problem that Beth Bryant couldn't figure out. Hoping to get a little help from the brilliant Stone twins, Rick and Ryan, and their idiot savant relative they call "Cousin", Beth leaves them the problem getting their assurance that they'll have it figured out by early afternoon. But by two o'clock, the calculus problem is the least of the foursome's problems. When Beth goes to retrieve the promised answer, she finds Ryan dead, s...