I was quite surprised by this novel. When I bought it and read the blurb, I expected something only vaguely connected with arthuriana, something maybe with a setting similar to arthurian, with some mentions of past arthurian characters and the story of a completely new character and disconnected from Camelot. Instead "Avalon" is quite connected with arthuriana, definitely more than I thought, and even if there were some things I wasn't particularly fond in the novel, I ended up liking it a lot.
This is the story of Argante, the daughter of Guinevere, hidden in Avalon with the Daughters (basically all ladies, some are warriors, under the supervision and rule of the Lady) where she is trained and tries to find her own path, told with flashbacks, from a time where Argante has become the Lady of Avalon herself. Her story is deeply connected with Arthur's one as she believes Arthur, the king, might be his father and I particularly loved the parts of the novels (in the beginning) where Argante struggled with her own feelings for Arthur, needing his attention and getting disappointed time over time. Mordred, Morgana, a version of Merlin, Nimue, Kay and Balin are all here, making the tale a renarration of the story of Balin and how he killed the lady of the lake.
In general yes, if you are looking for a love story between two women, with a lot of female and queer supporting characters, in an arthurian setting, this is definitely the novel for you.
This book gets a 3 instead of a 2 purely because it was written in 1991 and she made an attempt to tell the story, which even today some people don't.
Arthurian romances are a tricky business. The legends are a morass of contradictory oral and written legend. Avalon does nothing to untangle the mess; her sources are unclear and the writing frequently obtuse and dry. However, the narrative was charming and the characters moderately interesting, so this book is a good historical curiosity if nothing else.
Apparently Mary J. Jones never wrote another novel, which is a shame. This story is about the Lady of the Lake. In this reimagining, she's a sort of priestess and part of a female-dominated society, but the novel never falls into didacticism. Instead there is a great deal of imaginative world-building which draws more on the history of the period than on Arthurian legend, and the large cast of characters is well realized and varied. I read almost the entire book in a single night; it was absorbing and flowed easily.