diff --git a/lesson7/marshalling/20_bson_deserialize.go b/lesson7/marshalling/20_bson_deserialize.go
new file mode 100644
index 0000000..e5d2a52
--- /dev/null
+++ b/lesson7/marshalling/20_bson_deserialize.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"gopkg.in/mgo.v2/bson"
+	"io/ioutil"
+)
+
+type User struct {
+	Id      uint32
+	Name    string
+	Surname string
+}
+
+func main() {
+	var user User
+
+	bsonInput, err := ioutil.ReadFile("1.bson")
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Printf("Read %d bytes\n", len(bsonInput))
+
+	err = bson.Unmarshal(bsonInput, &user)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	fmt.Println("Deserialized value")
+	fmt.Println(user)
+}