diff --git a/config/install/rabbit_hole.behavior_settings.default.yml b/config/install/rabbit_hole.behavior_settings.default.yml
new file mode 100644
index 0000000..3602e5a
--- /dev/null
+++ b/config/install/rabbit_hole.behavior_settings.default.yml
@@ -0,0 +1,2 @@
+id: default
+action: "display_page"
diff --git a/config/schema/behavior_settings.schema.yml b/config/schema/behavior_settings.schema.yml
new file mode 100644
index 0000000..39cba35
--- /dev/null
+++ b/config/schema/behavior_settings.schema.yml
@@ -0,0 +1,11 @@
+rabbit_hole.behavior_settings.*:
+  type: config_entity
+  label: 'Behavior settings config'
+  mapping:
+    id:
+      type: string
+      label: 'ID'
+    uuid:
+      type: string
+    action:
+      type: string
diff --git a/src/BehaviorSettingsInterface.php b/src/BehaviorSettingsInterface.php
new file mode 100644
index 0000000..af94d0f
--- /dev/null
+++ b/src/BehaviorSettingsInterface.php
@@ -0,0 +1,22 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\rabbit_hole\BehaviorSettingsInterface.
+ */
+
+namespace Drupal\rabbit_hole;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+
+/**
+ * Provides an interface for defining Behavior settings entities.
+ */
+interface BehaviorSettingsInterface extends ConfigEntityInterface {
+  // Add get/set methods for your configuration properties here.
+  /**
+   * Get the configured action
+   * @return string The action id
+   */
+  public function getAction();
+}
diff --git a/src/Entity/BehaviorSettings.php b/src/Entity/BehaviorSettings.php
new file mode 100644
index 0000000..6cf1564
--- /dev/null
+++ b/src/Entity/BehaviorSettings.php
@@ -0,0 +1,55 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\rabbit_hole\Entity\BehaviorSettings.
+ */
+
+namespace Drupal\rabbit_hole\Entity;
+
+use Drupal\Core\Config\Entity\ConfigEntityBase;
+use Drupal\rabbit_hole\BehaviorSettingsInterface;
+
+/**
+ * Defines the Behavior settings entity.
+ *
+ * @ConfigEntityType(
+ *   id = "behavior_settings",
+ *   label = @Translation("Behavior settings"),
+ *   handlers = {},
+ *   config_prefix = "behavior_settings",
+ *   admin_permission = "administer site configuration",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "uuid" = "uuid",
+ *     "action" = "action",
+ *   },
+ *   links = {}
+ * )
+ *
+ * @todo Add redirect-specific configuration
+ * @todo Possibly it would be better to have multiple related config types for,
+ * e.g., bundles and entities formed like "behavior_settings.entity.X",
+ * "behavior_settings.bundle.X" - is this possible?
+ * @todo Add support for override for bundles (possibly in here, maybe
+ * as a sub-entity)
+ */
+class BehaviorSettings extends ConfigEntityBase implements BehaviorSettingsInterface {
+  /**
+   * The Behavior settings ID.
+   *
+   * @var string
+   */
+  protected $id;
+
+  /**
+   * The configured action (e.g. display_page)
+   *
+   * @var string
+   */
+  protected $action;
+
+  public function getAction() {
+    return $this->action;
+  }
+}
diff --git a/src/Tests/RabbitHoleBehaviorSettingsTest.php b/src/Tests/RabbitHoleBehaviorSettingsTest.php
new file mode 100644
index 0000000..7efa46e
--- /dev/null
+++ b/src/Tests/RabbitHoleBehaviorSettingsTest.php
@@ -0,0 +1,164 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\rabbit_hole\Tests\RabbitHoleBehaviorSettingsTest.
+ */
+
+namespace Drupal\rabbit_hole\Tests;
+
+use Drupal\system\Tests\Plugin\PluginTestBase;
+use Drupal\rabbit_hole\Entity\BehaviorSettings;
+// use Drupal\node\Entity\NodeType;
+// use Drupal\node\Entity\Node;
+
+/**
+ * Test the functionality of the RabbitHoleBehaviorSettings configuration entity.
+ *
+ * @group rabbit_hole
+ */
+class RabbitHoleBehaviorSettingsTest extends PluginTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('rabbit_hole');
+
+  private $config;
+
+  private $configFactory;
+
+  // private $testNodeType;
+
+  // private $testNode;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->configFactory = $this->container->get('config.factory');
+    // $this->testNodeType = $this->generateTestNodeType();
+    // $this->testNode = $this->generateTestNode();
+  }
+
+  /**
+   * Test that a saved BehaviorSettings entity can be found by the config system
+   * and contains the correct values
+   */
+  public function testSettings() {
+    $this->saveAndTestExpectedValues('test_behavior_settings', 'display_page',
+      TRUE);
+  }
+
+  /**
+   * @todo This test is failing - seems defaults are not being picked up. Why?
+   * Some inconsistent information about path, seems most likely reason - have
+   * tried config/install (as stated here: https://www.drupal.org/node/2120571)
+   * and src/install/config (from Drupalize.me video which previously seemed
+   * to work)
+   */
+  public function testSettingsDefault() {
+    $action = \Drupal::config('rabbit_hole.behavior_settings.default')
+      ->get('action');
+    $this->assertEqual($action, 'display_page', 'Unexpected default action');
+  }
+
+  /**
+   * Test that a saved BehaviourSettings entity can be given an ID based on
+   * a generated bundle (a NodeType in this case) and be found based on that ID
+   */
+  // public function testBundleSettings() {
+  //   $this->createTestNodeType();
+  //   $this->saveAndTestExpectedValues($this->testNodeType->id(),
+  //     'page_not_found', TRUE, 'bundle_');
+  //   $this->deleteTestNodeType();
+  // }
+
+  /**
+   * Test that a saved BehaviourSettings entity can be given an ID based on
+   * a generated entity (a Node in this case) and be found based on that ID
+   */
+  // public function testEntitySettings() {
+  //   $this->createTestNodeType();
+  //   $this->createTestNode();
+  //   $this->saveAndTestExpectedValues($this->testNode->id(), 'access_denied',
+  //     TRUE, 'entity_');
+  //   $this->deleteTestNode();
+  //   $this->deleteTestNodeType();
+  // }
+
+  // public function testLoadBundleSettingsWithDefault() {}
+
+  // public function testLoadEntitySettingsWithDefault() {}
+
+  private function saveAndTestExpectedValues($id, $expected_action, $id_prefix = "") {
+    // Delete key if it already exists
+    $this->configFactory->getEditable('rabbit_hole.behavior_settings.' . $id)
+      ->delete();
+
+    $entity = BehaviorSettings::create(
+      array(
+        'id' => $id_prefix . $id,
+        'action' => $expected_action,
+      )
+    );
+    $entity->save();
+
+    $action = \Drupal::config(
+      'rabbit_hole.behavior_settings.' . $id_prefix . $id)->get('action');
+
+    $this->assertEqual($action, $expected_action, 'Unexpected action');
+
+    // Clean up the entity afterwards
+    $entity->delete();
+  }
+
+  // TODO
+  // private function generateTestNodeType() {
+  //   return \entity_create('node_type',
+  //     array(
+  //       'type' => 'test_behavior_settings_node_type',
+  //       'name' => 'Test Behavior Settings Node Type'
+  //     )
+  //   );
+  // }
+
+  // TODO
+  // private function generateTestNode() {
+  //   return Node::create(
+  //     array(
+  //       'nid' => NULL,
+  //       'type' => $this->testNodeType->id(),
+  //       'title' => 'Test Behavior Settings Node',
+  //     )
+  //   );
+  // }
+
+  // TODO
+  // private function createTestNodeType() {
+  //   $this->testNodeType->save();
+  // }
+
+  // TODO
+  // private function deleteTestNodeType() {
+  //   $this->testNodeType->delete();
+  // }
+
+  // TODO
+  // private function createTestNode() {
+  //   $this->testNode->save();
+  // }
+
+  // TODO
+  // private function deleteTestNode() {
+  //   $this->testNode->delete();
+  // }
+
+  // TODO
+  // public function testSaveBundleSettingsViaForm() {}
+
+  // TODO
+  // public function testSaveEntitySettingsViaForm() {}
+}