In this final chapter, the case reaches its resolution, tying together the historical elements with the present-day problem.

The remnants of old structures, including plumbing, can affect modern systems and complicate repairs.

The first underground septic tank systems were introduced in the 1860s by the French. By the 1880s, such systems were being used in the US

Regular maintenance, including pumping and inspections, is necessary to keep a septic system functioning properly.

Neglecting a septic system can result in serious consequences, including leaks and overflow.

Holmes' eyes flicked toward the ground, his expression inscrutable. "Tell me, Mr. Jameson," he asked as we moved through the dimly lit corri