"Avalon" is the third book in the series "The Campaigns of Benedict Spinoza." The crew of the supertank of the Mammoth series receives a new mission - this time Darius and Tannhäuser are heading to the planet Tyndalia, to the Valley of the Graves. And how could they know what awaited them in one of the ancient dungeons? Investigator Sherlock Tumberg also had no idea what his long-awaited vacation would turn out to be for him. Instead of fishing, he had to again do what he wanted to take a break from. But the ancient magicians Allaton and Horrigor knew exactly why they met and where they needed to go in order to awaken Isandorra Tronkolen, the former Heavenly Hunter, from many years of sleep. They all became involuntary wanderers, and if not for Benedict Spinoza, the ending could have turned out completely different.