The monograph with title “Transverse Instability of Solitary Waves” and subtitle “Multisymplectic Dirac Operators and the Evans Function“, and authors Timothy Burchell and Tom Bridges, has been published by Springer Nature in December 2025 (publisher website here). It has 164 pages, introduces a new class of Hamiltonian PDEs in 2+1 dimensions, develops a theory for two-parameter Evans functions, and presents new results on the transverse instability of solitary waves. The photo below shows Timothy and Tom with a copy of the book fresh from the printing presses.