Series numeration from Goodreads.com.

Subtitle from cover.

"Restoring his recently inherited family home is a daunting enough task for young lawyer Nigellus Cobmartin without the addition of any unwelcome discoveries. But when workmen turning the crumbling manor house into a grand home for Nigellus and his companion, John Rykener, uncover a skeleton bound, tied and hidden in the wall - and holding the precious relic that went missing from his father's estate nearly twenty years ago - Nigellus immediately calls on London tracker Crispin Guest for help. Whose bones are they, and why was the valuable relic buried with the thief? Crispin and Jack are drawn into a mystery of dark secrets, family scandal and old grudges as they attempt to find the truth behind a load of old bones." --,Publisher description.