Victor Frankenstein's twin brother Konrad has become ill and none of the doctors can think of anything to cure him. But Victor has found a book in the secret library detailing instructions on making the Elixir of Life. He, his cousin Elizabeth and friend Henry all go on a quest to find the ingredients. It's a quest he can't afford to fail, but many things get in his way-impossible tasks, alchemy, and a love triangle involving himself, his cousin, and his brother.When I saw the summary, I was interested. Young Frankenstein? Heck yes. And a random twin and a love triangle? High hopes.We start with a lighthearted intro to all the protagonists, which quickly moves on and keeps moving throughout.The adventure kept me turning the pages wanting to know more at every turn.I loved the romance in this. We get our fair share of love triangles in young adult literature, but none of them ever come from the boy's perspective. It was interesting seeing something we're used to from a different pov, and the fact the two boys in this look identical, leading to midnight deception, added a bit to the normal love triangle template.The alchemy in this was thought out with clear rules. Our antagonist Polidori has a lot more to him than we first think, leading to a climactic showdown at the end.The characters all developed in huge ways, with Elizabeth coming more into her own and Konrad developing in a big way. Victor himself gains depth and complexity, and I can't decide if he's a better or worse character by the end of the book.By the very end, we're left on something in the middle of closure and a cliffhanger; This Dark Endeavour is clearly finished, but we have a clear motive for what will happen later in Victor's life-the part that Mary Shelley wrote about.Strength 4 tea to a prequel/retelling done excellently. I can't wait to see what Victor and co do next.