There "IS" more than one reason???

[sorkroto]

It always confuses me when using "there is/are". I thought it would be 'there are', but I could find lots of results with "there is more than one reason" search.
I'm also confused about the title of one Agatha Christie's book "And then there were none". People normally say "there is no one". Does the verb(is/are) depend on the whole context? Or is there a fixed rule we can use just anytime we use "there".

Thanks in advance

[bhaisahab]

It always confuses me when using "there is/are". I thought it would be 'there are', but I could find lots of results with "there is more than one reason" search.
I'm also confused about the title of one Agatha Christie's book "And then there were none". People normally say "there is no one". Does the verb(is/are) depend on the whole context? Or is there a fixed rule we can use just anytime we use "there".

Thanks in advance

Compare: "There is more than one reason" and "There are more reasons than one".
What do you notice?