Deciphering the BEAST, Bayesian Evolutionary Analysis with BEAST by Alexei J Drummond and Remco R. Bouckaert. Cambridge University Press, Cambridge, UK. 260 pp. Hardback (available from Sep. 30 2015, USA; and 6 Aug. 2015, UK). ISBN-10: 1107019656. ISBN-13: 978-1107019652. $58.49 from www.amazon.com; £39.99 from www.amazon.co.uk