ButtonTim and WalshSean**Philosophy and Model Theory.Oxford University Press, 2018. Pp. xvi + 517. ISBN: 978-0-19-879039-6 (hbk); 978-0-19-879040-2 (pbk); 978-0-19-250762-4 (e-book). doi: 10.1093/oso/9780198790396.001.0001.