If you loved Case Closed: The Fist of Blue Sapphire, try Detective Conan: The Scarlet Bullet
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
You already loved

Case Closed: The Fist of Blue Sapphire
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Detective Conan: The Scarlet Bullet
What they share
Both films are directed by Chika Nagaoka, and they sit in Action / Animation / Crime / Mystery territory. If that's the register that drew you to Case Closed: The Fist of Blue Sapphire, the second film will land in a comparable space — through a different lens.
What Detective Conan: The Scarlet Bullet is
Nagoya. Spring. Train whistle. A new superconducting maglev is unveiled as sponsors gather for the World Sports Games. But corporate bigwigs start disappearing. Conan finds a link to a similar kidnapping plot from fifteen years prior. For devotees of anime crime procedurals.