I want to know what a movie is called but can't remember (details in description).

it's a kinda older movie...there are 2 young teens maybe 12...one is poor but wants to he some kinda spy...the other is a Rick kid with everything. they think the one kids neighbor murdered his wife..so they start following him and trying to discover the truth and become good friends...that what I remember of the movie...but I haven't seen it in a long time and can't remember the movie please help!!

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