This is a good, not great, collective biography. There's a few extra tidbits that those particularly interested in the Romanovs would find interesting, especially the whole question of GD Serge and Ella's marriage. The author has also written a fictional account of these people under the name Theresa Sherman, and the title is "The Royal Mob."
For the longer review, please go here:
http://www.epinions.com/review/Ilana_D_Miller_The_Four_Graces_Queen_Victoria_s_Hessian_Granddaughters_epi/content_561162129028