The founder of modern hypnotherapy, Milton Erickson, already knew that what often has a particularly lasting impact on clients is what "resonates" in communication but is not explicitly stated. Many of his original interventions are based on this principle. But how does "therapy between the lines" work? How does multi-level communication function in practice? The book by Stefan Hammel, which is both illustrative and detailed, provides thorough insights on this topic. At the same time, it teaches the art of listening to the things a client says without them being explicitly formulated - for example, through metaphors, ambiguities, or body language, among other things. Mastering these skills can also be a key to the success of therapy.