  Intermediate polars with known rates of spin period changes are not numerous
because such tasks require measurements performed for a long time. To measure a
spin period change, MU Cam is a good candidate because it has a spin
oscillation with a large amplitude enabling measurements with high precision.
Fortunately, in the past the spin period of MU Cam was measured with high
precision. To measure the spin period anew, in 2014-2015 we performed extensive
photometric observations of MU Cam, spanning a total duration of 208 h within
46 nights. We found that the spin, sideband and orbital periods are equal to
1187.16245+/-0.00047 s, 1276.3424+/-0.0022 s and 4.71942+/-0.00016 h,
respectively. Comparing the measured spin period with the spin period of MU Cam
in the past, we detected the spin period change with dP/dt=-(2.17+/-0.10) X
10^(-10). This rate of the spin period change was not stable and varied in a
time scale of years. During four nights in 2014 April-May MU Cam was fainter
than usual by 0.8 mag, and the amplitude of the sideband oscillation was five
times larger, denoting significant fraction of disc-overflow accretion. The
sideband oscillation showed a double-peaked pulse profile in the normal
brightness state. When the star brightness was decreased by 0.8 mag, the
sideband oscillation showed a single-peaked pulse profile. In contrast, the
spin pulse, which was quasi-sinusoidal, remained remarkably stable both in
profile and in amplitude. Moreover, the spin pulse was also remarkably stable
in a time scale of years and even decades. MU Cam is of great interest because
it represents a distinctive object with a large and unstable rate of the spin
period change and exhibits a distinctive behaviour of the pulse profiles.
