The line between obsession and addiction is as thin as rolling paper. Neither are simple and both stem from absence, avoidance or — as Jenny, the dissatisfied housewife in Natasha Randall’s droll debut novel, calls it — life’s ‘marshmallow numbness’. Jenny’s drug? The sticky, sweet-smelling orange glue that seals the intimate letters she receives from a prison inmate called John — ‘just a little lick’ and a liquid warmth surges within her, letting her breathe, making the ground feel solid.