The book proposes the model of the unitary quantum field theory (UQT) where the particle is represented as a wave packet of some unified field. The frequency dispersion equation is chosen so that the packet periodically appears and disappears without changing its form. The envelope of the process is identified with a conventional wave function. The equations of such a field are nonlinear and relativistic invariant. With proper adjustments, they are reduced to Dirac, Schroedinger and Hamilton-Jacobi equations. The numbers of the new experimental effects are predicted both for high and low energies. It is calculated with big precision mass spectrum of the elementary particles and the fine structure constant. Also theoretical mass of the Higgs bozon-131.7 GeV was calculated. UQT explains the existents of the low energy nuclear reactions, of other exceptional phenomena and the possibility to create new sources of energy, for example E-cat Andrea Rossi.