  Context: We present a new study of the eclipsing cataclysmic variable CzeV404
Her (Porb = 0.098 d) that is located in the period gap. Aims: This report
determines the origin of the object and the system parameters and probes the
accretion flow structure of the system. Methods: We conducted simultaneous
time-resolved photometric and spectroscopic observations of CzeV404 Her. We
applied our light-curve modelling techniques and the Doppler tomography method
to determine the system parameters and analyse the structure of the accretion
disk. Results: We found that the system has a massive white dwarf M_WD =
1.00(2) M_sun a mass ratio of q = 0.16, and a relatively hot secondary with an
effective temperature T_2 = 4100(50) K. The system inclination is i =
78.8{\deg}. The accretion disk spreads out to the tidal limitation radius and
has an extended hot spot or line region. The hot spot or line is hotter than
the remaining outer part of the disk in quiescence or in intermediate state,
but does not stand out completely from the disk flux in (super)outbursts.
Conclusions: We claim that this object represents a link between two distinct
classes of SU UMa-type and SW Sex-type cataclysmic variables. The accretion
flow structure in the disk corresponds to the SW Sex systems, but the physical
conditions inside the disk fit the behaviour of SU UMa-type objects.

Solar and Stellar Astrophysics