4.8 stars to Armadale, just because the other Collins' book I read, the Woman in White, is a little superior.
Both books are a perfect time machine for who wishes to travel to Victorian England. The reasons for my interest in Victorian times are largely unknown even to myself, but a hint of it can maybe be found in the absence of telephones and motor cars in those times.
Queen Victoria herself described motor cars as "very shaky and disagreeable conveyances altogether" and was "not much impressed" by the demonstration of the telephone appositely made for her in 1878.
As well as in the Woman in White I wondered how many elaborate things and arrangements (though mainly mischiefs in Armadale), could be made by the simple exchange of letters, most of the times requesting a reply "by return of post"; letters enveloped inside other letters, or letters to be opened at a specific time or at the occurence of a specific event.