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M31N 2008-12a is a remarkable recurrent nova within the Andromeda Galaxy.With eleven eruptions now identified, including eight in the past eight years,the system exhibits a recurrence period of one year, and possibly just sixmonths. This short inter eruption period is driven by the combination of a highmass white dwarf ($1.38\,\mathrm{M}_\odot$) and high mass accretion rate($\sim1.6\times10^{-7}\,\mathrm{M}_\odot\,\mathrm{yr}^{-1}$). Such a highaccretion rate appears to be provided by the stellar wind of a red giantcompanion. Deep H$\alpha$ observations have revealed the presence of a vastlyextended nebula around the system, which could be the `super-remnant' of manythousands of past eruptions. With a prediction of the white dwarf reaching theChandrasekhar mass in less than a mega-year, M31N 2008-12a has become theleading pre-explosion type Ia supernova candidate. The 2016 eruption - to bethe twelfth detected eruption - is expected imminently, and a vast array offollow-up observations are already planned.

M31N 2008-12a - The Remarkable Recurrent Nova in M31