Lady Sherlock returns with a new case full of schemes, secrets, and festive brilliance.

Under the name "Sherlock Holmes—consulting detective," Charlotte has solved murders and found missing people. But she has never stolen a priceless work of art—or, more specifically, the secrets hidden behind a coveted painting.

When Mrs. Watson asks for her help to protect an old friend, Charlotte devises an excellent plan that leads her to a dazzling ball. There, amidst dancing and flirtation, the painting is set to change hands and its secrets are on the verge of being revealed.

By her side stand her loyal friend Lord Ingram, her sister Livia, and her mysterious admirer Stephen Marbleton. Each, in their own way, takes part in this twist-filled mission.

But nothing is as it seems. In the gardens of an impressive French castle, disaster lurks and someone is waiting for Charlotte to make just one small mistake.