Six months ago I had never read a Trollope-novel. Then - for no particular reason - I read 'The Warden' and have been addicted to Trollope ever since. I read the other five Barsetshire-novels in a row, and then immediately started on the Palliser-novels, of which this is the third (although 'The Eustace Diamonds' is only very loosely connected with the Palliser-family, Lady Glencora is the only one playing a role, and a minor one at that too).
In 'The Eustace Diamonds', Lizzie Greystock marries the wealthy but terminally ill Sir Florian Eustace, and when he dies shortly afterwards he not only leaves her an ample inheritance but - according to her claims at least - also an extremely valuable necklace. However, the Eustace family, and most of all their lawyer Mr. Camperdown, claim that the necklace is a family heirloom and as such was not Sir Florian's to give and should be returned. Before long London society is divided between 'Lizzietes' and 'anti-Lizzietes', and Lizzie goes to ever more desperate acts to keep the jewels.
Lord Fawn, Lizzie's fiancée, wants to break off their engagement because of the scandal surrounding the necklace, while Lizzie's cousin Frank Greystock (himself engaged to the governess of Lord Fawn's sisters, Lucy Morris) takes up her defence. Before they know it, they are all inextricably mixed up in the affair and have to deal with moral dillemmas: Lucy finds herself staying with the very family her fiancée Frank Greystock is attacking, Lord Fawn comes to realize Lizzie is definitely not the sort of woman he'd like to marry but is afraid is the scandal should he break off the engagement, Frank Greystock finds himself attracted to Lizzie and is in doubt whether he should give up Lucy (who is poor and cannot help his career as an MP) for Lizzie (who may be duplicitous, but is definitely also rich), ... Trollope, as usual, examines every aspect of his characters' thoughts and emotions in his 'habitual relaxed colloquium with the reader' (as John Sutherland and Stephen Gill call it in their excellent introduction).
What Trollope gives us here is a thorough examination of upper society, in which values and principles that used to be 'absolute' are rapidly changing: thruth (Lizzie lies and schemes incessantly but in spite of that remains an accepted, albeit controversial, member of society), honour (both Lord Fawn and Frank Greystock have to acknowledge to themselves that Lizzie's foremost attraction is her money). Though there is humour in the book, all in all it's a rather bleak picture Trollope paints here and there's little of the sense predominant in other Trollope-novels that, in the end, all will turn out well for the 'good' characters. In fact, Trollope shows that no one is entirely 'good' or 'bad', his characters (as we all, surely?) are a bit of both. Even Lizzie Eustace, who schemes and lies without any scrupple whatsoever, has some redeeming qualities while Lucy Morris, good and honest as she may be, quite frankly is also a bit of a bore...
The main reason why I gave this book 4 stars instead of 5, and why it isn't my personal favorite Trollope-novel, is Lizzie Eustace herself. I think Trollope intended to make her into a sort of Becky Sharp (from 'Vanity Fair') or Lady Audley (from 'Lady Audley's Secret') but - to me, that is - she falls short of both of these and fails to captivate one's imagination and dominate the entire novel as those two other ladies do so eminently.
But rest assured, a 'good' Trollope-novel is still a very good book by any standard, and reading it was definitely a very rewarding experience which has by no means lessened my appetite for more. So it's on now to 'Phineas Redux'!