I thought so, It's Lady Heather's Box
then after Brass goes in the house, Grissom says, "I owe you an apology, and Lady Heather says, "apolgies are just words" and let's Grissom in..
Correct me if I am wrong
Not exactly. Grissom and Brass (in Lady Heather's box) are already in the house. Brass was about to bring the suspect in so he leaves, then Grissom says "I owe you an apology" which Lady H answers with "Apologies are just words"
Hope I helped.