Synaptic Magic

There are question flying around in life for me, a lot of them are formed into hierarchies, making them related. An answer to one on top of the hierarchy will solve the ones down below. Among the questions at the very top of one of the hierarchies is the main question related to free will. Is everything in this world following a deterministic plan or is there the notion of real randomness existent? Is the brain functioning by pure physical cause and effect relationships or does something special happen in it when we desire. Is there free will or do we just flow in a deterministic ocean? If the neurons in the brain fire upon receiving electric signals and work as physical machines, then every action or thought caused by the communications in our nervous system and brain has a reason which can be traced back in time. If this is not the case, then inside every neuron, in fact inside every synapse, magic should occur, something should happen which has no scientific justification and no science can ever find out about it. Otherwise it will become predictable and there is a reason for it which makes it deterministic and the idea that we can make a choice on our own becomes meaningless since there is this endless chain of reasons trailing back. Whats really going on inside? Randomness, are you real? Is there a first cause?

The way I think and see life, I believe in big magic going on in there.