The novel follows the eponymous murders and their investigation as seen by Arthur Hastings, Poirot's old friend. Poirot receives typed letters signed by A.B.C.. In each is given the date and location of the next...
So you think you know Nero Wolfe, do you. So you’re reasonably sure that only the most dire emergency will induce Nero to heave his home on West Thirty-fifth Street, and that no case since his early days could make him budge from Manhattan Island...