Len Deighton's Only When I Larf is a late 1960s British comic thriller describing the activities of a team of three confidence tricksters led by Silas Lowther (late 40s), his girlfriend Liz Mason (late 20s) and wannabe apprentice and Liz-worshipper Bob (early 20s). It was published in 1968 by Michael Joseph and in paperback by Sphere.