1911. Love is in the air. Despite an unfortunate resemblance to her horse, Lady Richenda Stapleford has accepted an offer of marriage. Euphemia too has accepted one of her beaux. But the course of true love does not run true for upstairs or downstairs.
Euphemia, the estranged granddaughter of an Earl, who launched her career as a maid in the household of the corrupt MP Lord Stapleford, has now risen to the rank of housekeeper. When a senior member of the wedding party is murdered, it falls to Euphemia to solve the crime.