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We analyse new optical spectroscopic, direct-image and X-ray observations ofthe recently discovered a high proper motion cataclysmic variable V1838 Aql.The data were obtained during its 2013 superoutburst and its subsequentquiescent state. An extended emission around the source was observed up to 30days after the peak of the superoutburst, interpreted it as a bow--shock formedby a quasi-continuous outflow from the source in quiescence. The head of thebow--shock is coincident with the high--proper motion vector of the source($v_{\perp}=123\pm5$ km s$^{-1}$) at a distance of $d=202\pm7$ pc. The objectwas detected as a weak X-ray source ($0.015\pm0.002$ counts s$^{-1}$) in theplateau of the superoutburst, and its flux lowered by two times in quiescence(0.007$\pm$0.002 counts s$^{-1}$). Spectroscopic observations in quiescence weconfirmed the orbital period value $P_{\rm{orb}}=0.0545\pm 0.0026$ days,consistent with early-superhump estimates, and the following orbitalparameters: $\gamma= -21\pm3$ km s$^{-1}$ and $K_1 = 53\pm3$ km s$^{-1}$. Thewhite dwarf is revealed as the system approaches quiescence, which enables usto infer the effective temperature of the primary $T_{eff}=11,600\pm400$K. Thedonor temperature is estimated $\lesssim 2200$K and suggestive of a systemapproaching the period minimum. Doppler maps in quiescence show the presence ofthe hot spot in HeI line at the expected accretion disc-stream shock positionand an unusual structure of the accretion disc in H$\alpha$.

From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula