Henry, a 12-year-old boy, discovers his family's dark legacy when his mysterious grandfather suddenly dies leaving him alone on an isolated farm.

[2] Brad Wheeler from The Globe and Mail gave the movie 3 out of 4 starts, writing: The Canadian-made creep-fest begins laboriously as co-writer/director Michael Peterson figures out how to rid the plot of any phones.

(Every thrill-maker filmmaker has to deal with that pesky issue, but Peterson's methods are slower than a Macaulay Culkin growth-spurt.)

[3] Dennis Harvey, writing for Variety, stated: Michael Peterson effectively earns suspension of disbelief with stark atmospherics, solid performances and a persuasive escalation of panic.

[4] Noel Murray of the Los Angeles Times called Knuckleball "effective" and said: This is a tautly constructed exercise in suspense, set among striking-looking snowbound fields and farmhouses.