It’s the downside of the cult of Munroe bagging [ascending all Scottish mountains of over 3000 feet] that none of them can be truly secret – but Ladhar Bheinn’s remoteness allows it some degree of secrecy even so. One route in is from Kinlochourn via Barrisdale Bay and the other from Inverie [qv]. This website contains [smashing] photos but you’ll have no problem finding the route from Barrisdale if you search the mountain on Google or other engine.