A series of cyanide-bridged molecular magnets incorporating chiral ligands will be invstigated using muon spin relaxation. The magnets combine Ni(II) with M(III) (M=Fe,Cr,Co). The Fe compound has been studied in most detail so far and shows two magnetic transitions at 2.5K and 3K. There is evidence for non-collinearity in the ferromagnetically ordered state and a helical spin component coupled to the chirality is one interesting possibility. Previous muon studies showed a complex magnetic behaviour with static magnetic order only appearing unabiguously below the lower transition, whereas the muon relaxation shows critical divergence only at the upper transition. This proposal aims for more detailed information on the dynamic critical behaviour of the Fe and its Cr and Co analogues. A parallel neutron proposal is being submitted to study the spin structure of the Fe compound using WISH.