Sequel to Binky Brothers, Detectives that repeats the same structure as its predecessor - the older brother ostracizes his younger brother from the investigation, only to later learn his younger brother had solved everything already. The plotting is a bit more complicated here, employing some of the "bigger" twist tropes you might find an impossible crime novel, but the storytelling seems rushed - the "impossibility" isn't clearly established so the twists don't have the intended effect. Still, you admire its ambition to include such complexities within a child's detective story.
Seems like a Crosby Bonsall knock-off. Here we have Chub instead of Tubby. A bit confusing (though this is kind of the point), but the characters aren't very well-formed. Kessler's illustrations here are better than many of his, but still not up to the standard of Bonsall.