Sir Clinton Driffield Mystery series #4

In the fourth Sir Clinton Driffield mystery, the detective finds himself up against a missing heir, an accidental bigamist, a series of secret marriages and impersonations and an ingenious scientific murder. Aided by his wit and powers of reasoning, as well as Wendover, his very own Watson, Sir Clinton once again succeeds in piecing together a solution as the novel reaches its thrilling climax.
- from fantasticfiction.com