As therapeutics development in Alzheimer’s disease (AD) is broadening its search for therapeutic targets, one of the alternatives to amyloid-β, or at least to its direct targeting by monoclonal antibodies, that is coming into focus is triggering receptor expressed on myeloid cells 2 (TREM2). From a drug development standpoint, amyloid-β remains a mystery. Scientific evidence clearly suggests that amyloid misprocessing is an underlying factor in the development of AD, and it is certainly a reasonable hypothesis that reducing amyloid plaque should fight the disease.