Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the number in series for the episode title  "crossroads"?

### Inputs:
table_name: table, columns: ['No. in total', 'No. in series', 'Title', 'Directed by', 'Written by', 'Original air date']

### Response:
SELECT No. in series FROM table WHERE Title = "Crossroads"