With his older brother’s betrothal announced, Lord Michael Cynster is freed of most familial expectations. But the allure of his prior hedonistic pursuits has paled. Then he learns of the mission his brother and his fiancée have already been helping with and volunteers to help by searching for a hoard of gunpowder now stashed somewhere in London.

Michael’s quest prospects him to the Hendon Delivery Organization, where his singular source of information is the fetchingly attractive Miss Cleome Hendon. When about An Amazing Alliance Michael asks about the carters who transported the gunpowder, Cleo offers him a bargain: she will lead him to the carters he looks for, but only if he agrees to add her as the same partner in the mission.

But their investigation proves dangerous, and the further each goes in tracing the gunpowder, the more deaths they uncover. Quickly Michael and Cleo find themselves tangled inside a fight for their lives-one that makes them to handle what is continuing to grow between them, to seize and defend what they both discover as their path to the greatest experience of most: a shared life, a distributed future, a shared love.