I was lucky enough to get this Arbus-Peterhof book on eBay, from Gilbert's Royal Books. (Many thanks to Paul Gilbert!
) This book was published in time for Alexei Nikolaevich's 100th birthday, and is not to be confused with another very touching publication from 'Tsarskoe-Delo', titled 'Tsesarevich', which I happen to like better.
'Sunbeam' is tied in with Peterhof, the location of the Heir's birth, and the text mostly deals with those events in the boy's life that centered themselves around that location. Wonderful details about the boy's baptism abound, and some pictures of wallpaper from the dacha's rooms, of family possessions not all necessarily belonging to Alexei, and of a few other rarities add real color to the pages. The biographical sketch at the end of the book, however, seems almost to have been lifted from the forward of the Vagrius publication, 'Tsesarevich'; perhaps it serves as standard GARF material.
Quite a collector's item for those interested in the Heir, after all a 100th birthday doesn't come every day!