diff --git a/src/python/detectors/notebook_invalid_execution_order/notebook_invalid_execution_order.py b/src/python/detectors/notebook_invalid_execution_order/notebook_invalid_execution_order.py
new file mode 100644
index 0000000..f9efae6
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+++ b/src/python/detectors/notebook_invalid_execution_order/notebook_invalid_execution_order.py
@@ -0,0 +1,30 @@
+#  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#  SPDX-License-Identifier: Apache-2.0
+
+# {fact rule=notebook-invalid-execution-order@v1.0 defects=1}
+# Noncompliant: execution order of cells is not linear. When executing
+# cells in linear order, variables `x` and `y` are undefined before use.
+# —— Code Cell 1, Execution Count 2 —— #
+sum = x + y
+product = x * y
+exp = x ** y
+# —— Code Cell 2, Execution Count 1 —— #
+x = 12
+y = 13
+# —— Code Cell 3, Execution Count 3 —— #
+print(sum, product, exp)
+# {/fact}
+
+
+# {fact rule=notebook-invalid-execution-order@v1.0 defects=0}
+# Compliant: execution order of cells is linear.
+# —— Code Cell 1, Execution Count 1 —— #
+x = 12
+y = 13
+# —— Code Cell 2, Execution Count 2 —— #
+sum = x + y
+product = x * y
+exp = x ** y
+# —— Code Cell 3, Execution Count 3 —— #
+print(sum, product, exp)
+# {/fact}