The BEAM Book, Second Edition is a technical reference to the Erlang Runtime System updated for Erlang/OTP 29, covering the BEAM virtual machine's architecture including the BeamAsm JIT compiler, scheduling, memory management, and operations. Written by Erik Stenman, it expands on the first edition with new material on compiler internals, BEAM instructions, and practical operational guidance. Available in PDF and EPUB formats for €10 from Happi Hacking, with physical signed copies available at events.