Unlike the other permanent sets, LaCroix’s study is new in Season IV.  It is one of the rooms in an apartment above the Raven.  In the first two seasons, we may assume that this was used by Janette.  LaCroix, who was absent from the scene in the first year of the show, may have stayed with her after his return in the premiere episode of Season II; at any rate, he took over the apartment after she left Toronto, redecorating to his own taste.

The study is a relatively small set—though like the others, it looks bigger on screen because of the way it is filmed.  It is designed with three sides only, the central one having the door into the room, the one on the left having a window facing out onto the street (though this cannot actually be seen through the glass), and the one on the right being an internal wall.  The fourth—missing—wall is an outer wall, but on the side, adjoint the building next door.

The walls are painted a slightly greyish off-white, with white moulding at the ceiling, and high baseboards.  The floor is wood, but mostly covered by a large old Persian carpet, in predominantly red tones.

The window is fairly large; but it is concealed behind long, thick, dark green brocade curtains, with wooden slat blinds behind them.  Naturally, LaCroix keeps these closed during the day.  At night, he draws up the blinds and unlatches the window so that he can easily fly in and out, should he so choose.  But he still keeps the curtains closed, in order to mimic human custom, for it is prudent not to draw unwanted attention.

In front of the window, facing into the room, is a large desk of dark polished wood, the drawers bound with brass.  The top of the desk is inlaid with black leather, trimmed with gold leaf.  The desk is an antique, with drawers on either side.  On top, LaCroix keeps his lap-top computer, a phone/answering machine, an old Rolodex address file, and a fine silver desk set.  There is also a desk lamp—not that LaCroix, with his vampire sight, needs the extra illumination; but he recognizes it as a customary part of the ensemble.  A large black leather office chair is behind the desk:  broad-backed, with padded arms, swivelling on castors.

The door is panelled, heavy and solid, in a dark polished wood.  It is located no more than a third of the way along the wall from the window-end of the room.   On that side of the door, there is a painting hanging on the wall, with a tall narrow bookcase of dark wood beside it, right next to the door.  The shelves are fully packed with books; and set atop is the bust of himself that LaCroix had made while he was still a general in Pompeii.

On the other side of the door there are built in shelves, also of dark wood, which run the full length of the wall, round the corner, and along part of the right wall.  The shelves are full of books, of various ages, many old, but also modern, varying in size and condition.  They include fiction, non-fiction, and poetry, in many languages.

The bookshelves end with a built-in liquor cabinet and entertainment centre.  The liquor cabinet is smoothly white inside, and contains a refrigeration unit.  In this LaCroix keeps the bottles he has already opened, or plans to try in the near future.  His principal private cellar is elsewhere in his apartment, separate from the supply for the Raven, which, of course, is kept in the basement.

The entertainment centre includes a stereo and a television set, whose screen is kept hidden behind wooden doors except when LaCroix is actually watching it.

In the middle of the room are a pair of tall-backed wing armchairs, comfortably upholstered in dark green velvet.  A small antique table is between them, large enough to hold a wine glass or two, and whatever LaCroix may be reading.  There is a coaster on the table to hold the glass, and protect the surface from chance spills.  The chairs are positioned at a slight angle towards one another, facing the door.  Behind the little table is a modern-style brass standard lamp with double angle-arms to light each chair.