  We propose an approach to quantum theory based on the energetic causal sets,
introduced in Cort\^{e}s and Smolin (2013). Fundamental processes are causal
sets whose events carry momentum and energy, which are transmitted along causal
links and conserved at each event. Energetic causal set models differ from
other spacetime-free causal set approaches, e.g. Ref. [2] proposed causal sets
based on quantum information processing systems, and Ref. [3] proposed causal
sets constructed out of standard model particles. Fundamentally there are
amplitudes for causal processes in energetic causal sets, but no space-time. An
embedding of the causal processes in an emergent space-time arises only at the
semiclassical level. Hence, fundamentally there are no commutation relations,
no uncertainty principle and, indeed, no $\hbar$. All that remains of quantum
theory is the relationship between the absolute value squared of complex
amplitudes and probabilities. Consequently, we find that neither locality, nor
non locality, are primary concepts, only causality exists at the fundamental
level.
