Busman’s Honeymoon by Dorothy L Sayers

On their honeymoon, a newlywed detective couple find themselves embroiled in a murder mystery when they discover the previous owner of their new home dead in the cellar. As they piece together the clues, they encounter a number of suspicious characters, including the victim's estranged son, a disgruntled maid, and a mysterious visitor. Balancing their marital bliss with the grim realities of a murder investigation, they must work together to uncover the truth and bring the killer to justice.