The Stable Ledger
Straker bet against his own stable. Compute what laming the favourite was worth.
A trainer in debt to a milliner's bills lays money against his own horse, then reaches for the cataract knife. Set the stake and the odds against Silver Blaze, and weigh the motive.
Drawn from Silver Blaze (The Memoirs of Sherlock Holmes, 1892) — read the summary & analysis, or try The Night the Favourite Vanished, this story's game. More at the Game Room and the tool bench.