You can play the Vulcanverse books in any order, going back and forth on multi-stranded quests just like in Fabled Lands, but The Hammer of the Sun is the big one. At 1706 sections it's like two FL books combined. The discount applies to the paperback edition, which you can get at one-third off the usual price (UK) or almost half-price (US) for this month only.
(You can also buy the paperbacks from Amazon in Spain, Germany, Italy, France, and Japan.)
And while we're on the subject of open-world gamebooks, here's some more good news. Martin Noutch, author of the superb Steam Highwayman books, is creating a new four-book series called Saga for Spidermind Games, who publish the hugely successful Legendary Kingdoms gamebooks. Saga is set in the days of the Vikings, is described by the author as "atmospheric, morally ambiguous, and written with a love of place", and if like me you're an enthusiast for all things Norse then you'll want to bookmark that right now.
(Image by Wombo Dream, which has nothing to do with The Hammer of the Sun but I've been playing with it this week and I liked the Ditko-ness of this one.)
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