A flat in the centre and a short walk to most trade fair rooms, which suits an evening wedged between a late finish and an early start.

The centre is where a trade fair crowd sleeps, so her journeys are brief and an evening can be agreed at fairly short notice. Twenty-three, blonde, and quick to work out which of two people in a room is still in work mode. Czech and English are both on offer, and she makes no announcement when one becomes the other. She asks a couple to name the hour they will actually both be back, not the hour they hope to be, because an evening built on the optimistic version starts badly. An hour with one therapist between you is 360 euros, and she would rather that hour was late and honest than early and missed.

Betsy decides which bookings she takes and may decline any of them; she sets the limits for what a session includes, says what they are, and may end a visit at any point, as the terms set out.