Start implementing deserializer
diff --git a/main.go b/main.go
index d9e2676..912cca1 100644
--- a/main.go
+++ b/main.go
@@ -17,6 +17,7 @@
 	cpuprofile    string
 	heapprofile   string
 	katiStatsFlag bool
+	loadJson      string
 	saveJson      string
 )
 
@@ -29,6 +30,7 @@
 
 	flag.IntVar(&jobsFlag, "j", 1, "Allow N jobs at once.")
 
+	flag.StringVar(&loadJson, "load_json", "", "")
 	flag.StringVar(&saveJson, "save_json", "", "")
 
 	flag.StringVar(&cpuprofile, "kati_cpuprofile", "", "write cpu profile to `file`")
@@ -91,6 +93,12 @@
 func getDepGraph(clvars []string, targets []string) ([]*DepNode, Vars) {
 	startTime := time.Now()
 
+	if loadJson != "" {
+		n, v := LoadDepGraphFromJson(loadJson)
+		LogStats("deserialize time: %q", time.Now().Sub(startTime))
+		return n, v
+	}
+
 	bmk := getBootstrapMakefile(targets)
 
 	var mk Makefile