Roll20 is the gorilla (requires subscriptions if you really get into it at all) FoundryVTT is the best (does everything, friendly single-person indie developer) If you need character and material management: DnDBeyond (official source of digital material, excellent ch...
While this isn’t an issue if you are running the adventure via DnDBeyond or Roll20, it certainly limits the paperback copy’s effectiveness If you are looking for open sandbox, Sherlock Holmes-type adventures you will be sorely disappointed Buy on Amazon Icewind Dale: Rime of the Frost...