Historical Romance: Medieval, H/h get up to no good in a tent with a lot of soldiers outside, do lots of slinking around castles, a subplot might include uncovering the poisoning of someone

[Kenzie]

This one has been stumping me because it's similar to so many books that I'm worried I've started to confuse details between the other similar books. It's not Untamed by Elizabeth Lowell, although elements are similar.

I would've read this book in the early 2000s, maybe 2002-2007, although I don't know if it was new then or not (my mom had an expansive collection of romance novels, some new, some old, to read from). It's a steamy historical romance-- I don't have the exact timeline, but I'm inclined to say medieval as I remember lots of slinking around a castle and bedchambers and servants. I seem to recall a steamy scene in a tent at camp set up by H's soldiers. The H has known the h since she was younger, and perhaps even saw her betrothed to someone else. The husband or husband-to-be is not around (presumed dead? just away? I'm not 100% sure) and H/h are drawn to each other despite their best attempts. There may be a subplot where the two are uncovering the poisoning of the heroine's father, potentially by his mistress or her lady's maid. I believe a child is conceived. At some point, on the run from the villain, the heroine and someone else take shelter in either a cave or a church or something equally sort of almost eerie.

I wish I had more, but maybe this will ring a bell with someone.

[Kenzie]

Oh! It's also possible that the hero has known the heroine since she was quite young-- maybe since she got married? Or he was present at her marriage but had known her for longer? The poisoning could be from a different book, honestly, so if the rest of it rings a bell but the poisoning isn't part of it, let me know.

[Lobstergirl, au gratin]

Kenzie, are you still looking for this or did you find it?

[Kenzie]

I’m still looking!