A forbidden sonata. A deadly obsession. A case that will push Holmes to the edge.

When a celebrated Bavarian composer retreats to a lonely cottage in the Welsh mountains to finish his greatest work, he does not emerge alive. The manuscript vanishes, whispers of betrayal and lust spread, and a scandalous murder rocks London's musical world.

Summoned to uncover the truth, Sherlock Holmes and Dr. Watson find themselves drawn into a web of ambition, seduction, and greed. At its heart lies a piece of music so haunting that men would kill for it -- and a conspiracy that stretches from the glittering salons of Mayfair to the storm-lashed quarries of Snowdonia.

As passions ignite and lies unravel, Holmes must race against time to solve the most dangerous mystery of his career -- before the final notes of the Secret Sonata claim another life.

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