ONLY TO SLEEP (2018) *** by Lawrence Osborne Hardback published by Hogarth, 2018. 250pp. ISBN: 978-1-7810-9057-2 Blurb: The year is 1988. The place, Baja California. Private Investigator Philip Marlowe – now in his seventy-second year – has been living out his retirement in the terrace bar of the La Fonda hotel. Sipping margaritas, playing cards, his silver-tipped cane at…