Rasputin: The Voice of the Dragon (Dark Horse)

Rasputin: The Voice of the Dragon TPB
Hellboy's future guardian Trevor Bruttenholm, working for Britain's Military Intelligence, uncovers a collection of messages. The messages throw him into a world of animated corpses, deadly mystics, and Nazi agents. The treacherous journey leads him face to face with the man who will bring Hellboy to Earth--Rasputin!
Collects Rasputin: Voice of the Dragon #1-#5.
Writer: Mike Mignola, Chris Roberson
Artist: Christopher Mitten
Colorist: Dave Stewart
Publication Date: July 25, 2018
Format: FC, 144 pages; TPB; 6 5/8" x 10 3/16"
(U.S. Cover) Price: $19.99

https://www.darkhorse.com/Books/3001-273/Rasputin-The-Voice-of-the-Dragon-TPB

I originally bought this mini-series when it recently came out in individual issues (Nov. 2017 - March 2018) and liked it, but then again, I enjoy the Hellboy-related stuff that ties into the WWII era (and earlier). Rasputin (yes, that one) was one of the characters who appeared all the way back in the first Hellboy story arc back in 1994, and a few other characters in this story have previously appeared in other stories.

Anybody else read this series? Anybody contemplating the acquisition of the trade paperback collection?