  One of the most challenging difficulties that precedes the frequency analysis
of {\it Kepler} data for a Blazhko star is stitching together the data from
different seasons (quarters). We discuss the preliminary steps in the
stitching, detrending and rescaling process using the data for long-term
Blazhko stars. We present the process on {\it Kepler} data of a Blazhko star
with a variable Blazhko cycle and some first results of our analysis.
