This book provides a complete grammar of the Mani language spoken in the Samu (alternate French spelling “Samou”) region of Sierra Leone andGuinea. The data come from a short pilot study conducted during July and August of 2000, and a larger study taking place over two years (the Mani Documentation Project or MDP, 2004-06, and two brief returns in April 2009 and February 2010). That the Mani language will soon disappear is certain; just as certain is that this grammar will be the only one ever written.